HesAble, you aren't the one still doing your H's GD laundry, are you? If you are... stop that right now. (Or was it you, wooba?) Whoever is still doing their H's laundry... stop. Please, just stop. There is one simple step to taking back your power.
Also, stop following him on social media. If you enjoy checking your accounts, mute him so you don't need to see any of his shenanigans but you aren't cutting yourself off from your other friends via social. If you need us here to be your accountability partners on this, I'm happy to check in with you on this particular issue, if that extra incentive helps.
Choose one thing you want to do just for you that he would HATE. Do it and take childish pleasure in it. (This is my pettiness coming out. but it helps.)
Go buy super high thread count sheets and a comforter in a pattern you love. put them on your bed. If he doesn't want to sleep there anymore, his loss. Make it yours and love it.
And here's my last piece of advice-- if I were you, I'd plan to get out of the house on valentine's day with your kids. If you can afford it, book a hotel-- or go to a friends house and have a family sleepover. (I've done this, once with and once w/o my H, with really good couple friends. Our kids are friends too. It was SO fun for me but H hated it, his loss. Kids stayed up late watching a movie, had a fun sleepover, and then after we put the kids to bed the adults stayed up and had cocktails and chatted late into the night. In the morning we made coffee and bacon for our hangovers and talked while the kids played. it was so much fun and also free!) I have a suspicion that it will be difficult for you if your H doesn't come home Friday night and so whatever you can do to avoid knowing about it is healthy. (Also, imagine what he will think if he *does* come home and you aren't there!)
I think the biggest thing is to try to stop worrying about what he is doing or thinking and what that might or might not mean for you. Taking your power back is focusing on what you want and need and putting your energy there, not on him. He's being a d**k. Don't let his a-hole-ness affect you.
Me (46) H (42) M:14 T:18, D9 & D11 4/19 - 12/19: series of escalating BDs 9/20 - present: R and piecing