I've cried one to many tears for you. I don't know why

I've cried one to many tears for you. I don't know why i keep wanting to come back to you.  All you ever did was tell me how worthless I am and how selfish I am.  I'm not worthless, and I'm not selfish.  Who are you to tell me what I am or not?  I trusted you but you just stabbed me in the back, this is why I have trust issues and never want to talk to anyone.  I let you hold my heart and you tore it to pieces you threw it down, shattered it.  Guess what that heart belonged to me and I'm also torn down and shattered.  How will I ever learn to love again?