OH, Grisha!
Once again, I find identification in the rooms of WrongPlanet! Your situation is so close to mine, that I feel oneness with you.
I had met a girl while doing a college internship...she was doing hers, too. she went to a university across town from where I went. She introduced herself to me and even called me her little STUD! Anyhoo, we went together for a little while, but I found out that her real motive was to use me as a means to fund her recreational and weekend activities. It got to the point that I felt as though it wouldn't matter if I was there or not - as long as she got the MOOLAH!
She even tried to use sex to try to get me to do her bidding. I told her that if I wanted that type of relationship, I'd have gone and gotten myself a prostitute; she called me CHEAP. I called her A MOOCH. After so much of that, I got RID of her.
All the supposed loneliness I thought I was feeling went away as I began feeling that I really didn't need a relationship to be happy.
I did, however, start on that path once more, only to get the same results (only worse), and I cut it off much, much sooner.
I do have relationships with people I really like, but a romantic relationship is no longer a necessity or a desire for me. The very idea drains me of all energy mentally and physically.
For feeling this way, people call me selfish and tell me that I'm self-centered. I figure that it's better this way than for some poor girl to keep going through the same thing with me over and over expecting a different result (or me doing it)!
After all, that is the definition of INSANITY!