I think only you can decide what works for you.

Did you confront him already?

If cheating is a no no for you then end it. But maybe it’s not a deal breaker for you.

Many women stay with cheaters so we can’t tell you what to do. It depends what you are willing to put up with. Are you financially independent? If not you should try to get there. Sadly many people stay in bad marriages because they can’t or won’t become independent and would put up with bad treatment as long as their inappropriate spouse pays bills.

I urge you to thrive for independence so you don’t stick around for that sad reason