Hi - just popped on for a second and wanted you to know I'm thinking of you. Worries me that you think you have a serial cheater on your hands. I feel sometimes like I really get what we're supposed to be doing, but often I also feel new at this and lost.
I don't think you need to excuse or rationalize his behavior - more look at yourself and who you are and how you interact with him. Going to school is awesome - that's being the best you that you can be. Maybe where rationalizing comes in is saying, forget that OW making me feel uncomfortable on campus - he's my H, he's killing time with her because he isn't seeing how great I am...even though he thinks she's great/may be hooked on her, he's still coming home to me. Too bad she's buying whatever his story is, I know better and can change my situation.
I think some OW probably feel shame - I don't think most women mean to help a man cheat on his wife. And maybe he didn't take things to a PA with those women.
Who knows...now, what are you going to do this weekend? Movie, hike, manicure, study group with hot 22 year olds, concert?
Faith is, at one and the same time, absolutely necessary and altogether impossible. --Stanislaw Lem