You can try that, but sweetie, you need to look in the mirror and ask yourself, "But why???" This is also a man with a big problem and not a good partner for a relationship.
I really think that is THE question. Why do we hold on to people that are so emotionally screwed up that even if they DID stay with us they would not be healthy? He has a long road ahead as far as getting to a place that he could be in a healthy relationship. My STBXH is the same. He has so many internal issues, so much self-loathing, that he is seking happiness outside of himself. He isn't finding it. But he will keep looking and looking and when you no longer can make him feel good about himself [which is inevitable] he will start looking again.
I just feel like some people have so much healing to do that if they try to do it while IN a relationship all that happens is the partner has to expend SO MUCH energy to help them ultimately leaving themselves empty. Or that is what happened in my sitch. And ultiamtely it creates a man who thinks that he needs you to be healthy, which of course is the antithesis of true happiness.
I hope this wasn't completely convoluted.
Good luck Hope. Mourn the loss of your dream of a future but not the reality of what he has given you.