PLEASE HELP ASAP. BOYFRIEND AND BESTFRIEND PROBLEM?

So I jus found from a friend, my man hooked up with dis little ***** (names will not be said) anyways rachel has been my friend for years and when I was outta town last week visiting my mamma, they hooked up. they dont know i know yet, so what should I do? Should I beat the hoe up? or get my revenge another way? Iv'e been in jail before so I don't think I can hit hur. so what should i do?