Mia, it really comes across to me as you wanting to punish/withhold the kids from your H for what he has done to you.
Maybe someone else has a little more tact & grace but I'm just going to be blunt. There doesn't appear to be any good reason to deny your H more time with the kids.
Don't use the kids like this. It isn't going to hurt them to spend an extra night with their Dad, actually it would be GOOD for them.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction