How can I get my boyfriend back?

When someone loses trust in you or you lose total trust in someone (as with my BF), most of the time you can never get it fully back...maybe just a little but not totally.

But I don't understand that if what you did happened in the early part of your relationship and you had been with him 4 plus years...then why now would he break up with you and say he can't trust you. Sounds fishy to me. Sounds as though he just used that 'incidence' stored in his mind, to walk away as his grand excuse because he just wanted out to maybe deal with someone else.

If he really liked you, he would be able to forgive you after all this time.

Email thing sounds like a smokescreen. That's embarrassing, but not a trust thing.

I don't see why he waited 4+ years to end it. I do see how that could have affected the trust early on in the relationship. He just wanted a way out.

I think the trust bond has been broken. Why would it take him 4 years to realize this if it happened early on? Maybe he is using this as a way out? You are not a fool you just caught up. Never think of yourself like that. All relationships have some issue or another. I would just give it some time. Time heals all wounds. Once he sees you are moving on and happy with your life, he will call and you can talk.