I met this girl, call her Susan, that I really like. The thing is she thinks...

I met this girl, call her Susan, that I really like. The thing is she thinks we live too far apart (40 mins) and doesn't want a relationship. We agreed to just see each other. I thought it would be great, seeing a girl I really like and also the freedom to be single. I THOUGHT!

One day she goes drinking with her friend and this other guy and his buddy. I find out from Susan's friend that the other guy, call him Dave, has the hots for Susan. Later Susan is telling me bout the night that she went out and how she and Dave did this and her and Dave did that. She also tells me that Dave kissed her goodnight and got her number. She said she kissed him cause it would be rude not to kiss back.

This bothered me a little and I told her friend that I probably wouldn't be coming to see them very much any more. When Susan hears this she flips and says that we're not going out and that I never had her and that I have no right to get jealous. Now we argued for a long time and I think that for a strictly just seeing each other relationship, this is too much work.

I can't handle sharing her. what should I do, stick with it just to be the guy she's seeing or dump her and look for someone who's interested in a relationship?

Susan informed you in the beginning that she did not want a relationship with you. When you agreed to see her, you agreed to share her. If you can't deal with sharing her, don't.

Stop seeing her, and focus your time and energy on someone who is interested in a relationship, not a glorified friendship.