Relationship issue. Know what to do.

Me and my gf has been together for over a year now, in the start of the relationship everything was going fine, later I realized that she is a very lonely person and before meeting her I was not, but now even I have turned to a lonely and introvert person, I have no other friends in the entire city except her. I feel I have changed in a bad way after I've met her. I'm very much attached to her but I don't know what to do, I feel depressed and I feel our relationship has become toxic. She is extreme jealousy issues, sometimes for very very small things. She herself says that she can't even see me any other opposite gender she goes crazy if that happens. I just told her that I wanted to have a personal life too but she did not agree to it. I feel lonely now because I don't know anyone else here and I don't know what to do.