Help help help

I know my husband has been cheating on me but idk what to do. And this is the second time he does it. The thing is that he doesn't know that I know everything about this other girl. I checked his phone today and I saw all the text with this girl and the thing is that is the same girl he cheated the first time. I don't know what to do. Im going crazy and sometimes I want to tell someone but I don't know to who I can speak up to.