I want to know if someone is showing signs of interest in me.

We only talk occasionally but when we do he stares into my eyes for what seems like years. He is motionless when I am talking and I don't think he blinks much! It is a bit un-nerving and I have to break the eye contact because it feels a bit weird.

That's good, the lady should break eye contact first because the man is meant to be an alpha male. 

However, if he stands very close to me he only looks briefly but he will stand full on in a manly type stance.

When standing close it's much more intimidating, he will find it scarey himself staring at you from close, but equally he won't want to scare you away from moving away from him by staring you out.  The male stance is basically him displaying his alpha male traits and trying to dominate the space and make himself look bigger to you.

He seems to make up reasons for standing close to me.

That's certainly not a co-incidence!

He was playing with a pen once and sort of smirking. Like rolling it between his fingers. I don't know if this means anything!

If he was looking at you at the same time, I think you can safely say he was thinking of rolling around with you.  Imagine one of his hands is him and one of his hands is you, and he was rolling them against each other.

I know this man has a girlfriend who he lives with but he has given me loads of reasons to suggest he is interested.  Although he hasn't acted like a sleezebag at all, he has treated me exactly the way I want to be treated. No staring at my boobs or bottom! He looks at my hair a lot and sometimes my lips.

Looking at your legs and hair are very important.  Guys like nice looking hair, they get tempted to play with it and well the lips, he's probably thinking of kissing them.

Since we have known each other his clothes have improved a lot.

He's trying to impress you. 

He also gave short answers to me at first but for a while now he gets deep into conversation with me and dosen't like it when I have to leave!

When you first meet someone, you are kind of trying to find out whether they are friendly and trying to get comfortable being around them.  That's why guys tend to be short at first, then as they get more comfortable and they are re-assured that the woman wants to be around he will feel more relaxed and able to have a longer conversation. 

If I say I'm going he starts talking again about all sorts of things.

Doesn't want you to leave.

Sex has come up in the coversation a few times (said by me) and we will talk about it briefly, he hasn't really said anything himself.

That's good, because he will see you from a sexual point of view.  Too many woman avoid mentioning sex, that results in guys seeing them as friends, it basically results in a guy not feeling turned on by a woman and that's when she tends to fall into the friend bracket.  You do have to be careful you don't go over the top though, because you can result in him, trying to push you towards having sex too quickly.

Sometimes he will repeat the last line of a sentence I have spoken and smile!

Parroting demonstrates several things, firstly he is mirroring you, secondly he's demonstrating that he is listening, thirdly it shows he's nervous and can't think of things to say, so he's buying his time by repeating what you said, fourthly he could be deaf and trying to make sure he heard what you said properly by repeating it over to you.  Usually guys will repeat the sentence in a surprised/enthusiastic tone of voice.

As I said he has a girlfriend and I wouldn't make a move for this reason. However, I do like him a lot and would definately go out with him if he dropped her.

Good for you.  I would say that everything that you have said has been positive and demonstrated that he fancies you.

If he is playing me in your opinion would you please tell me.

You have said anything to suggest he is playing you.  I know he has a girlfriend already but that really does not suggest that someone is playing you.  Playing someone is a completely different concept and just because a guy has a girlfriend doesn't mean he doesn't find other women attractive.  So, no he definitely isn't showing signs of being a player, in fact everything that you said has suggested he has a genuine interest in you. 

I have spoken with a good friend of mine about him but she is incredibly negative about men (they are all the same type of attitude)and thinks he is a player. She has never seen us together and not seen him at all though. I don't adopt this attitude at all and judge each man individually as I think thats fair.

Good for you, from what you have said to me, he is not a player, a player is something totally different to what you describe.

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