Yes I understand. OW can hurt. But you know what? It shows you what you will and will not be able to deal with. It makes you stronger within yourself. We all think we will act one way in a situation and then when the sitch happens, you might act totally different. I have a friend on here who I relayed her sitch to a GF and she said I would never put up with that. But when you love someone, you put up with a lot. It also shows whether the love is unconditional or not. Yes eventually, you have to focus on your own mental health, but running is not the answer in most cases.
I have been told by many older people who divorced and are remarried (relativly happily), that if they could do it over again, they would. My parents, who have been divorced for over 20 years, still tell me they would get back together. It is wierd hearing it from both of them. Of course they don't even talk anymore but.... Interesting.
You have to stop chasing. Believe it or not, he will probably contact you. It may take a while, read Yellowrose's sitch, her H would disappear for weeks at a time or more. Then he would resurface. Reading here helps you know you are not alone going through this horrible thing. It also will help you to understand that the mind just isn't right.
If you focus on the past, you ruin the future. You can only live for today.