What am I to do

Boyfriend of 5yrs been searching up his ex wife's name n then hes been on a dating site called meet me now using his old pic of him and his wife as a profile pic and on that site its under brad randi Brest..... which is pretty fucked up cause he claims he loves me but yet I catch him doing stupid shit.... then I show him what I seen on his phn ...... but he claims hes doesn't know whK that's on there he didn't do it