What will you do if you know your partner is cheating ?

Confront him because there is no way I can pretend I didn’t know anything n just behave normally with him. Probably will leave him after that. Cheating is a big no no, and I’ve made that very clear to my husband. If he cheats, it’s over. If he knows this n still choose to cheat, it just means that I didn’t mean enough to him n he doesn’t care if i leave. So I’ll go!