Breaks are not easy, that's clear. But once you have your finished, you have to do is start looking forward and taking small steps to gradually be overcome.
It is normal at first (and more depending on what has passed between you) every time you see your ex will come forward to tell all. But that only lasts a while. You have to be careful not to get hooked on hatred, something that almost everyone has been occasionally (which can happen also with former bosses, ex-friends ...)
Putting evergreen obsessed with everything he does, do not stop to investigate what it does and what does not do, talk to everyone about it ... are things that should make you stop to think.
And that feeling of hatred is destructive for you as well and eventually, it will not bring any benefit, so forget it and enjoy! There are lots of things waiting for you.