Like people said, you’re only 18 and you will have plenty more relationships (I know that doesn’t help now, but keep it in the back of your mind). When I went away to college, I was completely alone and it took me a long time to make friends, but I eventually did. The best advice I can give is to take things a day at a time. Whatever fears you have, I promise that they are worse in your head.

I often think back and wish my past self could see me now. You will grow a lot in your 20’s. But most importantly, your relationship with her is over. Maybe one day you can be friends. I had a friend in college who walked in on his girlfriend fucking someone else. He took her back and h walked in on it again. How stupid do you think he felt? Just know that her cheating has absolutely nothing to do with you. Absolutely nothing. It has everything to do with her issues, whether it’s her insecurity or commitment issues.