Cheating husband

I (34f) am extremely depressed. A month ago I found out my husband(33m) was cheating on me with a married woman(37f). He says he loves her and they now speak everyday(guess her husband works a lot). I know I shouldn’t care anymore it is not my problem but I can’t help but care. I have the women’s number and the husband’s number and I sometimes want to reach out to him and tell him but I’m not even sure if it’s my business. I don’t know what to do and I’m am hurting because just like that I was replaced and just like nothing he moved on and he is not hurting about the break up. It was 16 years….. how does one just not care from one day to another? He is okay that we dont text or call anymore and it hurts that he moved on so quick with no repercussion for breaking up our family. Any advice other than move on? I know I need to.

Ps. Every one is saying to tell the husband, should I wait till I’m divorced? I was a sahm and he pays for everything still.

Update: told the husband on instagram and he blocked me 😅