The key thing is to learn from your mistakes so that you don't repeat them. And you seem to get that.
I think it can be quite healthy and helpful to be able to air the anger/resentment towards the WAS. Keeping it pent up inside, or denying it is not healthy at all. The trick is not airing it out towards WAS. Go the gym and hit a punching bag, or vent to a close friend (not a common friend with WAS). When you express those things to a WAS it puts more pressure on them and that is never a good thing.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019