okay so I have been with my gf for about two years now when we first started dating I she told me she was a virgin about a month and half later we had sex when we had sex it was in her house with her parents their( by the way where 16 at the time we are both 19 now) and we have sex for like almost an hour later on in the relationship we began having problems with a "guy freind" of hers he would constantly text her call her to hangout or ask her what she was doing so me being her bf I would get pissed and tell her not too talk to him because I soon notice she would start deleting his message to so I wouldn't know she was talking to him she then began skipping school and going to hangout with her freinds and him( she did this for like a month and stopped she said it was stuipd and only getting her Introuble) she then began stop skipping at this time we still hangout everyday and text all the time until she hung out with her friends a couple weeks passed and the guy was doing the same sh*t we had a big argument over it then she stop answer eveythiing to him and eventually they stopped talking a little later passed by and one day she left her phone on the bed so I went to her Facebook. I wanted to check to see if my gf was as innocent ass she acted to I went to her past timeline and saw that  before we started dating she would talk to a lot of guys all the time and hangout with them all the time she would constantly tell different guys that's she loves them and can't wait to see them again and tell them how much she misses them. My gf is from chile so she told that over their everything over their is different. That over their that is how people talk to eachother even if their friends I had a hard time believing it but brushed it off.  I know it's bad to be checking and doing that but I already had trust problems. With what's previously happened. I then notice that their was one guy she really really would talk to like every day constantly non stop all day and she seem really into him I asked her about all of this and she got mad telling me why I don't trust her and stuff I then asked that if she lied to me about her virginty and she got even more mad saying that we should brake up and go Separate ways and from then she would constantly try to fight and have an argument then try to make up and be really nice. Eventually time passed and we got over it then their was one day  that's a guy that she claim she used to like went in to her job and talked to her I worked with her at the time because she wanted me to work with her to have extra money for the both of us. Alittle passed then one day we had a big argument and she broke up with me a day later she was then texting this guy. She told me she didn't want to be with me anymore but invited me over to her house that's how I find out she was texting this guy and she got mad told me that we are not together that it's none of by bissnuess what she does so I left the next day she invited me to hangout with her Again she was still texting this guy and I asked why are you talking to him and haveing me over here with you she then told me he is just a freind but later on that week when she invited me to her house and I was waiting for her to get off work she ditched me to hangout with this guy and her friend well she told me   She went to her friend house to get a couple of things and ended up going to his house at this time it was 11 at night she had me wait for her until three when she got home I told her I was done and to never talk to me again so I left when I got home she started blowing up my phone telling me about how her freind forced her over their and stuff the next day she stopped texting that's guy and they never texted since then now at this point when we go to have sex it rare that we even have sex anymore and when we do it always like 15 20 mins and she's always saying the whole time that it etheir hurts or she can't breather she always saying something is wrong or trying to give me instructions I'm only 7 inch so Ik I'm a descent size but at this point I can't tell rather to believe her or not rather I'm blind or what and I need help I need to know if I should just end it and move on in my life or what I need to know if anyone really thinks she was a virgin or better yet if she cheated on me