You being the only one that has called him on his BS, and then held tight and not let him weasel back in means he won't come back because he knows you won't fall for his crap anymore.
He isn't man enough to be alone. It terrifies him. So, rather than find someone to have a healthy relationship with, which would take time, he keeps trying to get someone that fell for his BS before back, because it would take less time than actually doing a relationship the proper way! If he can just get one of the OW to let him back in, he won't have to do all the dating stuff, the hard stuff. He can just fall back in to her life and her bed and it will all be good again.
He's just too broken to step back and look. He just needs some woman to tell him how wonderful he is and stroke his ego. He doesn't know how to do real.
Why are you still wasting time thinking about it? Eh. As long as you are still ranting at him....it's normal. He was part of your life for a long time, and sometimes it's just hard to not hear some of these things and try to figure out WTF they are thinking. BS(me) 46, Two wonderful teens.
He is no longer my best friend. Repeat until it sticks.
WH says marriage is over: May 15, 2009.
EA#2 July 20, 2009. Legally sep: Aug 16, 2009. DIVORCED!!!! Signed Nov 23, final Dec 24, 2010, adultery listed.