I think the problem is you are not letting yourself get over him. I mean, you are looking at his facebook???? WHY??
Block him on facebook, knowing you cannot look at his page, it just helps. I am currently getting over my ex and i know it is hard. But i think the best thing to help, is to just accept everything. Understand nothing is going to get better until YOU let it. I mean, stop thinking about it. Instead of feeling upset, think 'Yes, i can finally look forward to finding what i REALLY want in life'. Not having a prick for a boyfriend, you are making way for something amazing to come, you cannot see it yet, but it is coming. Good things come to those who wait.
Why would you even be jealous over her? He will only do the same thing to her as he did you, you should feel pity for her. Nothing else.
Yes it does get better, there will come a time when you just dont care at all anymore. It will feel awesome and you will be glad you stayed strong
You have all the weapons you need... Now fight!