<human>: Can you summarize the given text in a few sentences?

(throw away) 
Ill be as frank as possible to you redditors since you have been an outstanding community on giving out logical and sound advice. I am a 19 year old male in college out of town and I have a girlfriend who is in highschool with 1 year left. We have been dating for nearly 3 years but the longer it goes on, the more I feel like I want to separate from this person. I cant help but try to make this relationship work but I feel that it will be all for nought. She has had an abortion about half a year ago but i never told my parents about it and only her parents knew. It put a serious strain on our relationship but we persevered through that difficult time. While at college she seems to trust me less and less, much to the credit of me trying to do stuff during the weekends such as drinking and hanging out with friends and meeting new people at parties. She dreads the thought of weekends for this very reason. She always think that I will cheat on her at any given moment. This is also largely due to lapse in judgement and memory when I cheated on her and she found out several months later, while she was still pregnant. The trust factor is literally below absolute zero. What makes things worse was the time when I tried to seperate but she threatened to tell my parents who are extreme right wing catholics. The first whisper of abortion and they get their game face on. If she were to tell my parents( I dont doubt she wont because she is extremely emotional and threatened it before), my college career would cease to exist. Money from my parents would immediately stop and I would be outcast to my parents (probable). I cant deal with her shit anymore and I feel that separation is the only way I can come out of this positively; albeit risky. How can I go about this breakup without her wanting to tell my parents my deeds?
<bot>: I want to breakup with gf of 3 years, has mound of shit that she could use to ruin my life.