final advice

You will reconnect with those that you feel hate you, right now. Those in your class, your friends.
You have to hold your hands up, accept your mistakes and show them that you can act maturely about this. Show them that you know you did something wrong, but that you accept that it was wrong and you're not going to make the same mistakes twice. Also, remember that you didn't actually know that something was going on between them, so you're not entirely to blame. Just so long as you accept your mistake and show you're sorry in a mature and reasoned manner, they will remember why you're a good friend to have around. And whilst you'll building that up again, you have the girls and the family, your friends from back home, and your (actual) family. You are not alone.

Don't ever think you're weak, because you're not. You're ill, confused, a mess right now, but you're also the strongest person I've ever met. So, no matter what, don't lose sight of what's important - if people don't want you in their life, then that's their loss. And honestly, they're losing out on much more than you are - they're losing out on being friends with you! All you're losing out on is people who aren't worth the time. So think about that.