Think I was the rebound guy

hey yall i have a serious dilemma some background info is i have known this girl who is currently 22 years old for over 6 years due to her being my little sis best friend throughout that time i have always like this girl but about a year into the friendship she started dating a guy who was about 20 yrs older than her. During that time i no longer bothered myself with her. So now now present situation starts off that she is an trying to get her papers so she offers me a deal to pay me if i help her do it. i being a young guy needing money and wanting to help a friend said of course. Fast forward 2 months into the deal after us talking and catching up i figure out that that she had recently broken up with the older guy because of him not treating her how she wanted to be treated. It also bothered her that he did not want to help her during there 5 yr relationship to get her papers. So a couple months go by and we start really dating during that first period she cheated on me with her ex and explained it that she was tired of not knowing who she want completely. After she begged to get back together i eventually gave in and we resumed our relationship and it was a good relationship. just recently i found out again that she cheated on me with her ex again and blamed it on the fact that one night i had gotten her angry and that nigh after dropping her home she had open the door again with her ex and started talking. I'm in a weird position because first off i'm pretty sure i in love with this girl but i cant keep having her go back to her ex. I also cant ignore this girl because we are still doing this agreement until about the end of next year and now yesterday she sends me a text says some crap about how she made a mistake and she wants to come back and he knows now that i'm the right one for her i want to with all my heart just take her back but i know if i do there is always a possibility that she will go back to her ex.

yea but the only problem is that its hard to get over her because i have to deal until her green card situation is finished which could take up to 1 or 2 years

This older guy has a very big hold over this girl. She says she is tired of not knowing who she want completely Why don't you decide for her..... She may well hurt you again.... get away and meet a nice girl that SEE'S YOU ..... I think the big age gap with this other fella has allowed her to not grow up to still remain dependent and childlike.... You are being used.....

your right mountain thats what i been trying to do for the past 2 week but she uses the green card issue as an excuse to chat with me then try's to talk me into starting a relationship again i keep tell her that i want to just keep it business

Don't give in to her so easily. Let her repent, let her keep assuring you for a longer period until you are sure she has closed off her ex forever. If she has really realized her mistake and wants to be with you, she should try harder to convince you. One fight should not land her back into her ex's hands. Give it a time off period and see how she is going about it. Unless she has recovered from her breakup, its not possible for her to concentrate on a new relation. So refuse to be the rebound guy and tell her clearly she should be over with her ex before she starts another relation.