It will get easier. 4 months seems like a long time at first, but you'll look back in a year or two and wonder how fast the time went by. Glad you had a good visit with your family. It must've been nice to see them after so long. Exciting news booking that Holiday trip...I'm sure that'll be a lot of fun!
Sounds like you're doing the right things: working out, not drinking, setting boundaries about not seeing her at school. Keep putting in the work...you'll get there.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21