how can I fut the rope?

Hi, Im so glad to find you here, I like the way you are bld and not say nice things just b/c you are polite! :) I’ve been married for 5 years, my husband is a nice guy, loving me and providing life in its best way, but he has this bad habit of cheating, which he relates it to his childhood issues and problems. His first cheat was 3 years ago, almost, 8 months after we got married, he came to me and confessed himself, that hes been unfaithful, he met the girl online, and had sex with her for few times in some hotel. after a long time of being heartbroken, I told him we will close the file, b/c everybody makes a mistake, but if you ever do that again, I will be gone.

last year I found out hes been having an affair, which he was trying to hide form me, with a 21 years girl-he is 40- and he started acting weird, and got a major depression. I stood by him b/c he was really sick, and the whole time he was denying everything untill I checked his cell phone bills and found out about everything…its a long story, … I was so hurt, and I started seeing someone, while we were in the same house, .. after he confessed he had sex with her as well, - he was telling me he only was helping her because she was a damaged girl- I seperated my bedroom, … he promissed he will stop talking to her, but I was so upset… after 3 months, I found our hes been starting a new relationship with another woman… now I’ve filed for a divorce, but we are still like best friends, talking every day, and we somehow cant cut the rope, he begs and cries and asks me to give him another chance, but I cant, but at the same time, I cant stop talking to him, we still care for each other a lot… what can I do,,, and feel free to ask me more questions if you want