My friend put his ass in my face, but he said he was straight

So I was at my friend's house and it ended up so that I was laying on the floor and he was sitting on the floor and he played nervous (a game in which one player touches the other player and asks if they are nervous, if they are, they lose) twice with me. When I was about to leave, I was sitting on the couvh and he was standing. He bended over and put his ass in my face (inches away) and asked if I liked it (I didn't reply). I came out as bi to him and told him I'm interested after, and he didn't do this again, but hints that he likes me (I will say things related to me liking him and he will drop hints, and will act really lustful when we are talking, and acts lustful in general). He says he is straight, however. He also self-depricates so I will compliment him (my theory) but not out of selfishness, because I know he truly doesn't think he is as terrible as he says he is. I want to know your opinions because he is playing mind games with me and it is real confusing. All of my gay friends say they think he likes me, but I need some advice. I'm going to have him over sometime, and I will see if he starts anything, and/or is fine with if I start anything.