I am strongly sexually attracted to an acquaintance of my husband.

This man is very accomplished as a professional athlete, has natural charisma and authority, is a strait, honest man with obviously a body to die for, and is  probably 15 years older than me. He has a lovely family and I do not want to interfere with anything about him and his life.

Unfortunatly, due to our way of life, I happen to meet him on a regular basis and this is hell for me ; each time I see him, I try to look indifferent or strictly friendly but inside I am so happy, and high, and I don't know wether I am a good actress or if everyone can see my feelings.

With him being an athlete, I'm sure there are many other women who meet him, who feel exactly the same way.

I only started to think about him as a sexual partner from little signs from him, such as him coming forward to talk to me, him trying to know me a bit better, having glimpse at my waist or legs,

He wants to get hold of them and his unconscious brain is just checking them out for size and shape. 

trying some humour, and his very deep and serious look when he looks at me ( I feel I am drowning into his eyes and I just become hypnotised). I feel as well that his eyes are seeing through me and that he knows my feelings, which is horribly embarassing.

Guys like this will be used to women falling at his feet.  The fact that you act indifferent to him, will make him feel as though you are more of a challenge than the others.  So he will be keen to impress you, to prove that he can have you too.  I'm not so sure he will see through, I think it will be more he is confident with women and used to everyone of them fancying him.  So that confidence will make him think, she'll fancy me and if she doesn't I'll make her.

We are both married with kids and would never jeopardise our marriage for a fling ( I think...).

Yes, with emphasis on "I think".  In reality though, you probably would get caught in the heat of the moment and caught up with the fact that he is a professional athlete and that will score well in your self-confidence chart, that you can have a professional athlete.   Then once you've made the mistake you will realise you both have happy families and you have just put that in jeopardy, just for the sake of a short affair or one night shag.

Anyway I would probably hate to be his everyday partner as he looks as he is a very demanding and self-centred man (as most athlete are).

I think you will find many women are hitting on him all the time and he will probably be tempted by a few of them, like for example if he ends up having sex with you, then he's being unfaithful to his current partner.  He will have a lot of confidence, some athletes have their feet firmly on the ground, others let it go to their head and think they are way above anyone else, they can use women for sex and do whatever they want and get away with it.  I think it usually depends on their upbringing and how young they became professionals. 

I don't know wether he is just romantically attracted, sexually interested, actually checking out but not interested, happy to feel desired and enjoying the ride ( many men would ?)or just embarrassed to be desired by me.

I doubt he is romantically interested if he has a wife and kids.  He would have already been through the romantic phase with her and will be quite bored with all that.  Sexually interested yes, he has all these women after him, some of them are going to be too tempting and if they promise a discrete relationship then he will jump at the chance.  Problem is relationships never turn out to be discrete.  He could be in the early stages of checking you out to see if your interested and see if he is interested.  Happy to feel desired..... I doubt it.  He will know he is desired, he has a wife and sure he has plenty of other women falling at his feet.  Enjoying the ride..... (more like he will enjoy a ride if you are offering).  Men don't particularly look to be desired they look for sex and/or relationships.  Yes, it can give a guy self confidence if women are flirting with them, but ultimately he wouldn't mind having a ride with any of them.  Embarrassed to be desired by you.....what is there to be embarrassed about

I cannot stop thinking about him and day dream of a sexual encounter (if at least it was bad sex, maybe I could be delivered from his spell?).

It's like a status thing isn't it, almost like you are buying an expensive desirable thing in the shop, it makes you feel good temporarily if you can have it because it's so untouchable but in the long term it's nothing more than an object that you desired at that moment in time.  Because he's this amazing professional athlete that many women would desire but can't have, you want it, to boost yourself and make yourself feel great that you can have such a guy, but really it's nothing more than a whim, that's not going to work out long term and stands the chance of completely wrecking your marriage.  If you are very unhappy in your marriage then fair enough, but if you are happy and have kids, is it really something more exciting to go and shag an object.

Because he is such an accomplished charismatic handsome man always surrounded by hansome and successful athletes and I am such  a physically normal woman I feel I cannot possibly attract him and this is boosting as well as shattering my confidence. On the other hand, I stand out because I am foreign, with an accent, an artist, and I am quite bubbly, spontaneous and happy to do sport.

You'll stand out as someone he'll want to shag, it doesn't really matter about the other stuff, he might seem interested in the fact you are an artist but really, that's him just trying to sweeten you up.

Please, tell me that I am just not interpreting well his signs and that he is just not interested!

From what you have said, I can't really gather that he is either interested or not interested, there is simply not enough information there to suggest either way.  What I am sure about is that even if he does fancy you, he won't be the slightest bit interested in the fact that you are an artist or you are happy to do sport.  Unless it's the sport that he likes doing in his bed.

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