IS this cheating your man watching porn with a female roommate ?

Well as most of you read from pervouis question my roommate is a female and she ex co work and friend whom happen to have feeling for my man and she ended up moving in with us .Well after tonite Ive just found out the nite was out at our new home getting it ready he didnt stay the nite with me he went home to the old place his excuse was he has to work in the morning blah blah but i come to find out THEY watched porn together he had the nerve to tell me this and tryin to tell me nothing happen between them. And he doesnt see what the problem is with it . I guess I got myself into a bigger mess than I though forgiven people isnt always the answer I guess.