How to deal with mother than makes comments like this?

I divorced my spouse, she cheated on me, ran off with another guy and abandoned our children. I got sole custody of the kids and am raising them by myself. I never ask for help from anyone and support my children. I found out my mother goes to see my ex and takes her clothes and food. My ex told my mother we were getting back together which is a lie! My mom called me and told me she's glad my ex and I are getting back together and how she was against us getting a divorce in the first place. I do not tolerate cheating under any circumstances and my mother thinks I should of looked the other way. I wanted to go off on her but I didn't. I basically told her to stay out of it, I make my own decisions. Now she's mad at me and got my brother on my case about this too. I don't understand why. Why? Why? Why?How to deal with mother than makes comments like this?
You are an adult. Make your own choices and dont look back.How to deal with mother than makes comments like this?
i think your in the right for ending it with her, but why stop her from having contact with the kids your mom should stay out of it and let you and her sort things out because your kids will suffer in the long run. don't forgive her for cheating but just try and get along for the kids sake
mother always think that they should listen to them no matter how old the kids are,they just wnt to continue to be in your life no matter if you have your own life and family,but set your mom down tell her that if she wants to continue to be your exs friend that is her business just leave you out of it,and that you love your mom and respect her she needs to leave this matter up to you because you didnt enjoy getting hurt by your ex and that she should respect your desecion and just let you be happy after all that should be all your mother cares about his your happiness and your ex does not make you happy.