OK my ex boyfriend and I broke up 4 3/4 months ago we talk and everything but the thing is I still love him, but he has a girlfriend and I don't know what to do, I'm the one who messed up that's why we are broken up but id do anything to get him back so what could I do or what should I say I'll do anything to get him back I love him so much

You need to stop talking to him. If he can have a girl friend and still have conversations with you, why would he want anything to change?
He has moved on, you should too.

It's heard to get over your first and it's really heard to get over him when it was me that messed up and hurt him not the other way around, I love him s much

Well there are consequences for actions. He moved on and you lost out. He now has a girl friend. You need to do what's right, take your medicine and move on.