You forgive yourself - it wasn't your fault. You set that aside and when you're ready, and only when you're ready, you try again. Have confidence.
Patients young patawon...
Take a break, patch yourself up and when you feel like you're ready try again...kind of like learning to ride a Bike I suppose. It's hard but when things get going its rewarding.
Simply know that not everyone is as stupid as the last person who betrayed you. If everyone is, then it's time to tie a rope around your neck and choke yourself to death. The world is full of people--unique people.