I don't really have too much advice because I have a hard time letting things go myself but I would delete the contact info and block the facebook. It's definitely not good for you to look back and hurt from things like that. I would suggest to avoid all evidence of it and just let time do it's thing. It doesn't always work and sometimes you have to confront the issue but I feel like time really does help.

I think, something important to note is that he has obviously moved on and the bitterness and pain you carry is only hurting you. Especially with hating him, it's like swallowing poison and expecting him to keel over. It really does suck and I'm very sorry that he did that to you. With self worth though, it's more about being gentle with yourself you aren't a big baby. He obviously hurt you really badly and you need time to recover so give yourself sometime. And be gentle with yourself. Stern when it comes to thinking about him (avoid it) and think about how much better you have it now. And remember, the best victory is to show the world (specifically him) how much happier you are now and than you were with him

Best of luck!