Problems with "casual" relationship

Kristy

I came out of a long-term relationship awhile ago and have been seeing someone casually for a couple of months. He's in the same situation (not wanting to get tied down) so we agreed to have a purely sexual relationship. I like having my space, being able to meet up with him for drinks and then go back to his place after without the hassle of having to stay over or worry about when he'll next call. This all seems to work in theory, but a few nights ago I was out at a bar (with another guy) and I saw him kissing another girl. He has no obligation towards me and I know that although the chemistry is great, we don't really get along outside the bedroom, but I felt really jealous and upset about it. I didn't confront him and I would hate to appear neurotic or posessive, but it bothers me to think that he is seeing other women on the side (even though I am open to seeing other men). I feel like a hypocrite for even having these feelings. I am angry with myself for not being able to become emotionally detached from this guy or have no-strings-attached sex. Am I not emotionally mature enough to handle a casual fling??