It does seem like you have been doing a lot of running around him. Dbing seems to work best when small changes are made, and then impact monitored.
Quote: I try to pretend like she doesn't exist, but when I pick him up from work on Mons for MC and see her, it kills me to think of them there together all day (although he swears he isn't having anything to do with her). I'm thinking of asking him to drive to MC separately because I can't stand to see her. It would also save me an hour of leave. I hate to do that because we have been going out to eat before C and it's nice to have time alone, but I'm thinking the effect of seeing her isn't worth it. Either that, or I could pick him up 10 mins late to avoid seeing her walk across the parking lot. Any suggestions?
Try asking him to go to MC separately. Do this as an act of self love. For yourself. Understand the consequences, and accept them. See what happens.