I just read your whole situation, and I feel your pain. I feel very sorry for you!
I understand your confusion surrounding the 180 of offering to watch the kids. I also made my wife feel guilty for going out. I wanted more together time, but she wanted more free time. A therapist once described it as "me time, us time, and you time." I wanted more US time and she needed more YOU time.
I hope someone more experienced is able to chime in. I'm curious to see what others think as well.
M34 W35 S5 S2 T10 M6 on/off over the years including her A Recently- Nov 2015 bomb Nov 2015-Feb 2016 Reconciling Feb bomb March-April Reconciling May - bomb Mid-May I tell her I'm done