Relationships

After 5 years of a relationship, I don't see light in the end of the tunnel.

I'm in relationship with my girlfriend for more than 5 years. We started dating when we started our studies. First it was good as for the most people. We were seeing each other often and it was great. We wanted to be alone with each other without other friends, because we couldn't get enough of each other. After few years I proposed to my girlfriend (I knew that she wanted this very much) and she was very happy). For me marriage is not that important, I don't see it so special as my girlfriend sees it. All that time before my proposal we had our fights too on or off, but some time after my proposal all these fights were just happening more ofter and relationship going down hill. My girlfriend seems like she is obsessed by me. As I was talking that first we wanted to be alone with each other. And after that time passed for me, for her it didn't. She didn't wanted for me to hang out with my friends. She was scared that I may go wrong way and I would cheat, even though I would never do that. After some time I noticed that she whines almost for everything, she doesn't have some thing that other people have like lots of expensive clothes or phone, or car. The thing is she previously dated richer guys, so she was spoiled and wanted all this, but I couldn't provided that, even though she says she loves more then anyone else she loved. Also for some reason she does not like my family and she wants to have me only by herself. When I tell her that for weekend I would go to meet visit my parents, she would get mad/sad, but when I ask her to go with me she would just make some reason why she can't come, even though I know that reason is BS. If some times we go together to visit my parents, she complains that I give her not enough attention when we are there. Like I'm talking with my parents more then with her etc. So after all this, our relationship gives me only bad feelings. And I could say there is only one thing left that is still good between us, and it's sex.. It is really great between us. I think if not this, our relationship could have ended long time ago. But it I feels that even this thing may not be the same for me as it used to. Even though my girlfriend craves me still the same. She wants to have sex with me quite alot. But now, I started looking at other girls, and imagining what would be like to have sex with other girls. Of course I had these thoughts before too, but not that often as I have now. Also my girlfriend said, she couldn't stand if I left her. We talked and are talking about this quite a lot, but I feel that she may even do something crazy if I dumped her, because she is attached to me so much that it looks she does not care about anything any more. And the more she complains about everything the more I just want to ignore her. I just can't stand all this sadness she started bringing to me. But I feel bad for her at the same time..
After 5 years of a relationship, I don't see light in the end of the tunnel.
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