I Need Opinions!!

So yesterday my boyfriend was talking to one of his old bestfriends(a female) and she was telling him about her shitty boyfriend & etc & when he came home he told me he "accidentally" sent a flirty text to her. Saying shes beautiful and deserves better etc..he said he mentioned he has a girlfriend(me).. He barely ever calls me beautiful or anything at all.. Personally i think sending a flirty text is cheating. Whats your opinions?