Since the thread is titled trying to fix your mind, any tips;

It's tough, having someone break up with you. The important thing, about letting go of the relationship, itself, is recognizing that it's not 'you' that is the broken toy, it's the relationship, itself. the mixture of you and him, didn't create a functioning toy, so to speak. It's stepping back, and recognizing that it's not you the person, it's the relationship, as a separate entity, that 'he' also contributed to as not working out.

A tip,is to step back, as hard it is, not feel as though it's you that is discarded, it's the relationship that is discarded, as though it's a separate entity altogether. If you desire happiness, understand that the relationship not working out, isn't a reflection on who you really are as a person. You have qualities that will gel, just right, and much better, with someone else.