Guys: He says she's just a friend, am I being played?

a guy I've been seeing has a friend whose life revolves around him. he says she's just a friend, and I believed it even when he spends more time with her and even when he sleeps at her place often.

but recently she went out with us and he allowed her to have his attention the whole time. the two acted like a couple. even tho he isn't interested in her, he sure gives everyone the idea that he is.