First, I am sorry you are having to deal with this. I know how bad it stinks when your S is having an A and you have to basically sit and watch it happen. No worse feeling in the world. So I really feel for ya.
As for your #2, please try not to figure this out. You will never get it right, and all it will do is pull you into sad and depressing thoughts. I know you want answers, and I will try to tell ya how I see it from a guy's perspective. I may not be right, but maybe it will help. After that...no more mind reading!!!
I suspect your H is texting you because you are still his Plan B. Your revelation about OW not wanting to be his full time gf really points to this. He got rejected, and you were the one he fell back to. He wanted comfort and emotional security. Same as I would do...as I discussed in my thread. When I would get out of a relationship I would fall back to an ex or a safe bet where I could not have to deal with any void and move on quicker. Your H probably chose you as that fall back. You say he is off getting sex with all these other women, but I can tell you that having sex with a woman is NOT any proof of emotional attachment. I suspect your H's sex life is strictly physical. His emotional bank seemed to be at the mercy of OW, not his other sexual partners. When she dumped him (sorta) he seemingly turned to you. In other words, if he had any emotional involvement with the sex partners, you would not have been the one he was texting. My guess he is in a way experiencing what a LBS does with OW at this point. I suspect he is becoming more and more clingy and pursuing simply because he is feeling he is losing her and hey, what do we LBS do when we realize that? Perhaps this could be the beginning of the end? Who knows. But you do have a pretty good idea his life is not as happy as he would want it to be right now. And that bodes well for you...
Chin up!!
Me: 42 W: 32 Married 7 years together 8.5 S1: 7 S2:7 Bomb #1: 09-16-13 Recon #1: 11/13 A discovered 04-03-2014 W filed D 05-19-14 but never served me I filed D 12-02-2014 S 05-31-14 Divorced 5-19-16