Fighton - love your focus on your vision board. Good stuff!
As for him taking your son to the party and all the ruminations there? That's a time sinkhole. (I've been there so I would know!) Rather than thinking about him and his motives (which you can't know [he may not even know them]), could you have used the time off for you? Did you want to go to IC?
Each time your mind turns to him, zap yourself and think: what about me? What do I need right now? What do I want?
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced