To set the scene I was busy at my desk one day and I heard this beautiful deep soft scouse accent, I looked up and saw a man that I have never been able to stop thinking about ever since. Whilst he was busy talking to my colleague I felt myself immediately glance up direct into his eyes to tell him that I thought his voice was sexy, then I had to force myself to look away as I realised that he may think I was being rude by staring at him,

Definitely wouldn't have thought you were being rude, he would would have been instantly attracted to you because of your eye contact. 

he finished his coversation and walked off, I watched him as he walked down the office, I felt a feeling I had never felt before, I don't know the words for it, it felt as though I was completely shocked or 'in love'.

Butterfly feeling in your stomach as if your blood had suddenly rushed from your stomach to your head and your lips. 

At that moment in time I was actually living with someone to whom I was engaged to, I surpressed the feeling and just put it down to hormones and I put him to the back of my mind.  About a month later, completely unexpected my fiance tells me he doesn't want to be with me anymore, so we have gone our separate ways. I instantly thought back to the guy with the scouse accent and ever since I have not been able to stop thinking about this guy, he does work in my office and I do see him everyday and I have contact with him occasionally in the office through work.  I investigated to find out if he was seeing anyone, I learnt he had never been married, no kids and I was really upset when I found out that he had been single for a long time and had been looking for someone but had just started to date someone.  Instead of realising 'game over' as he is now seeing someone, it has gone the opposite way, over the past 6 months I have been battling with my emotions about this guy, he is on my mind constantly, I try to surpress my feelings but as soon as I see him I feel all 'soft' inside,

Oh yes!

and I want him, I glance at him, somedays he is really busy so I don't get any glances back, but other days he returns my glances but I am not sure how to interpret this, I feel nice that he returns my glances but frustrated as I know I can't have him as he is with someone else. 

I wouldn't see that as overly conclusive, but first impressions last and I reckon the first moment you met where you looked him in the eye, would have made him interested in you. 

He went away for a couple of weeks and I missed seeing him everyday and when he came back he was looking at me, I think to establish if I had seen that he was back, I wanted to get the first glance in to let him know that I had missed him but I did not look at him as I did not want to let him know that I had missed him,

Dumbing down your true feelings, typical thing for a woman to do.  He needs the idea that your interested not the idea that you are not interested. 

because I do not want to fall in love and be hurt,

OK, that's fair enough then, he has got a girlfriend after all, so you should be persuading yourself that he is not available.   Maybe it was right not to show interest in him after all.

I then felt bad about not looking at him to let him know that I had missed him and was then worrying thinking that he may think that I had gone off him or was not really interested in him.

If he fancies you, he will have been disappointed and will have read it as a negative sign.  It will mean that you will have to win back his confidence that you are interested in him. 

I am also aware of the fact that as he has a girlfriend I don't want to make it too obvious to everyone in the office that I like him as it may get back to his girlfriend who also works as the same company and it may upset things between them. 

That's fair enough, very admirable of you. 

We have spoken on two occasions one was in a group conversation were I had chance to check his physical features out more closely,

Oh yes

this made things worse for me as he is just slightly taller and the right build for me,

What that has to do with whether you find a guy attractive I don't understand, do women stand there with a tape measure and think no you are not suitable, your not the right height and width.  I know what you mean though, you are assessing his body to see whether you are attracted to him physically.

this has led to more frustration, we did actually have a conversation whereby I felt he was keen to listen to me and wanted to talk to me and that we could have talked all afternoon given the chance. Another time involved him purposely making himself visible to me as I walked back from the canteen by crossing over to walk on the side of the path I was walking on as he walked to the canteen, I got the feeling that he did that on purpose so that I would see him, I think he wants me to 'chase' him, make all the moves, but I'm not sure.

Because he has a girlfriend he is more likely to want you to do all the work.  After all he can't go around pursuing women when he has a girlfriend, it would make him look a creep.  Some guys are not bothered and are brave enough to look a creep, if they don't value their girlfriends enough and are not bothered what other people think.  But some guys like to be loyal to their girlfriends, particularly if they are getting on well and don't like other people thinking they are creeps for pursuing other women.

He is quite a bit older than me I am in my thirties and he is early fourties, which I prefer, but I am wondering if he may think that I am too young for him.

He most likely will do, it's a common feeling amongst older men.  That's another reason why he will be very cautious and slow about approaching you.  He doesn't want to appear like a dirty old man and feel as though he's trying it on with you, which would scare you off.  So he's letting you get to know him slowly and doing it cautiously, so he doesn't scare you off.  

I don't know what to do, should I try and stop thinking about him and wait for him to become available if ever or should I follow my feelings and purely try to think about what I want, and in the end probably destroy his realtionship with his girlfriend,

I think at the moment you should just start thinking of him as a friend.  Then if he finishes with his girlfriend you will be in a good position to become his next girlfriend.  Of course it's important you don't get too attached to him because that is going to frustrate you.  He's only in the early stages of his relationship and in those stages things are prone to break up quickly.  Certainly don't go about deliberately breaking up his relationship because then you are forcing yourself into a relationship with him, which probably wouldn't be good for your long term relationship prospects.

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