That's not even the worst part. He also had a crush on another girl, who he also cheated on with, and I think he's been seeing her for years now. I don't know what to do about this. I feel so horr

Ified.I'm sorry you're going through this. You may be in your early 20’s and it's hard to imagine what it must have been like for you as an adult when you were a teenager, but it's so important to remember that your own actions and choices are just as important than the person you're dating. You don't need to date someone who cheats on them, but you should still be able to be friends without being sexually involved with them. It's just such shitty behavior.>It is so bad.