Betrayal hits hard. Even the name sounds painful.
People often hurt others because they're hurting themselves and can't understand what they're doing.
Also contributing are feelings of jealousy, self absorption, a lack of maturity, inability to communicate conflict and pain avoidance.
None of this is right. None of it really helps when you're the target of someone's inability to cope.
So what do you do?
a) Move on. You don't have to remain friends, but you do have to let go of feelings that drag you down. If it's not helpful to be in their space, then move on.
b) Forgive. Let go of the pain by focusing on your present and future friends, family, opportunities and the person you are. If it's possible to remain on friendly terms, give the relationship time to see if they're really sorry and making changes that you can trust. Over time.
c) Wish them well if you decide you have to move on. Bless them in whatever way feels most appropriate to you.
It is perfectly okay to distance yourself and give yourself time to heal.
Are you willing to give any of the above a try?