Yes, he can
get over her and be happy for them
if your girlfriend AND your best friend turned on you- wow- that must hurt
Well, it depends on if you like your girlfriend, if your best friend is a girl, then trust me she should like you back.
Forget him
Grow up, please. If you like your best friend, you don't love your girlfriend. You girlfriend cheating on you is not reason or justification for you to do it back. You didn't like being cheated on, did you? So why would you do it back? You obviously forgave her & tolerated it. If you can't, LEAVE YOUR GIRLFRIEND. Do not go out with your best friend if you're not single.
you need to tell your best friend that you do not like them that way.
Your girlfriend still loves you. You're her boyfriend. When a girl says she loves her male best friend she means it in a family kind of way. As long as she still spends time with you and says she loves you, you have nothing to worry about
wait your time will come
It depends on if your ex still likes you and if her friend is willing to help. If she is, then ask her to talk you ex into giving you a second chance.
You could get someone to talk to like a best friend or find something to keep your mind off him
start thinking of her as a friend and not as a ex girlfriend. treat her as if she is your friend and try to get comfortable around her as a friend.
Kindness, honesty, and being a good friend.