Why Do Men Want What They Can't Have?

I have just spent a week obsessing and making myself sick over relationship drama. You've heard the story before. Coworkers, boy and girl(me), she's married, he's in a relationship, totally platonic. Until....

A bunch of us are out on a weekend, cutting loose, dancing and drinking. Said boy decides to drop a bomb on me, and profess his emotional and physical feelings towards me. Its like he read my mind and said what I wanted to hear, but my lips were sealed. So I tell him, "we can just be friends". And that's that. Except, I feel so angry at my friend, ex-friend. We went from being friends to this awkward avoid each other game. I feel played even though nothing happened.

Ya know what, he knows I am married, so first of all he should have steered clear and kept his mouth shut out of respect for that alone. And secondly, talking to other female coworkers, he has attempted this behavior before. And looking back, there were a lot of little clues that I ignored because I thought he was just a flirty kind of guy. He even once told me that he cheated on his current girlfriend before and he used to be a "bad guy". Now I feel like he has just been playing me and testing the waters for weeks. What gives? Who does this guy think he is to go out and mess with women's heads.

So lets say that he is just that stupid and doesn't realize he crossed the line...yah right, but even still, he is only kidding himself...I may be fun on a Friday night or during the work week, but that is not reality. We go out to forget life, but that's were it ends. I shouldn't have to give up going out with friends and having a good time to avoid being hit on...and normally it doesn't bother me, infact its nice to feel desirable but not by your guy friends that you trusted. You can't have your cake and eat it too. He must know that. Seriously, does he think that I would throw away a marriage, for a fling? I am moving in a month, I want children soon, I am just like every other woman after a long work week who gets stressed and moody and PMSs (i.e. not perfect :) I am done dating and sleeping around-does he not realize any of this? How does he mentally think I am even on the menu? Does he not see beyond my legs and ass?

I am not that naive, I realize that some boy/girl relationships will inevitably end up at this point, since there is always some element of attraction involved...initially. I am angry because I almost started believing what he said, he was so convincing, and pays so much attention to, how I smell and what I look like and made me feel irresistable with him, and I really feel guilty that those feelings took control over me when I 100% love my husband...was I seduced by the emotional words he was feeding me? I have many other male friends who I have never had this much drama with before, so I feel like it will be really hard to trust my male friends again. My husband and I have talked it all out, except I haven't had any closure with the guy. Do I tell him off? Does anyone else have similiar experiences?