OK so I poisted a while back that my girl left me but now we are back together she asked me back out but now she is away at school and I miss her a lot but I can't get the feeling that maybe she is just with me to feel not so homesick? And like I'm a little insecure about her going to those frat parties and stuff I mean ill never tell her what to do but when she is like I'm going to a party tonight I can't help but feel insecure cause I don't want to lose her to that stuff I trust her though but deep down I'm a little insecure I don't know she is incredibly beautiful and I know guys will try to get with her

Is there a way for me to get over this stupid feeling?

No if there is no trust no relationship.

Find the help of a professional to restore yourself esteem and self confidence. You really don't need to be in a long distance relationship, as you already have a lot of issues to deal with on your own.