Numb feeling

I found out my husband uses his Fitbit to chat to girls and then gets their snapchat info. When we first got together he had this problem, without the Fitbit. And then again right before I got pregnant and then at the end of my pregnancy.

I feel so gosh darn stupid for staying with him and then marrying him. I understand the need for porn. I watch porn, but i don't understand why anyone would chat with other girls in any other manner then friendly. Or cheat.

I'm just so done. I feel nothing but anger and what feels like shame.