Oh I have been there! I was in a similar relationship that left me feeling the same way. It wasn't until I finally decided to face my anger and disappointment that I have been able to move on. So here is what I did and I hope it helps..
1.) Absolutely think of only you and what your feelings were and are now.
2.) Ask yourself the tough questions and really answer them!!!
3.) Find strength in your weakness, you are only human after all.
4.) When you're ready you must forgive him and yourself for all that happened.

Lastly, remember things like this happen so we can improve and evolve ourselves! Take this challenge in stride, be patient and polite to yourself in your process. You will get there! The longer you just wait for it to fix itself the longer you will be trapped in your past! Good luck!