I'm struggling with my anger, I thought I was past

I'm struggling with my anger, I thought I was past it but I never expressed my feeling last year when things finally ended with my ex-wife? My feelings never really matter in our relationship because it was always about what she needed, wanted and felt? I gave everything and it was never enough. In the end I gave her the house and the kids and paid child support 18 years in advance? Cheating was my final straw. When someone can't look you in eyes when you know it's over, there is no peace? So I did what I always do, I do what comes next. Changed my whole life around, moved far away, got sober, feeling good, looking good, I'm loving life again and here she comes trying to make nice again? I'm a very forgiving person but I don't want this anymore and please don't mistake my kindness for weakness, it hurts me to hurt someone I used to love and have kids with but I'm sick of this shift! What should I do?