How can I tell if this guy is gay?

ok I want to no if this guy is gay?? when he comes to my house he and I take a rest on my couch once I was laying on it and he found a place to sit on it and his arm would touch mine…he badly wants me to get in shape(he works at LA FITNESS) he says oh that guy is ripped…he once got a boner while driving me to work(I pretended not to notice)…when we are in his car I put my arm on the arm rest and he always gets closer and closer to my arm…he showed me his wrestling singlet and he really loves it..he has a portait of a half naked burt reynolds on is wall in his room and says that his aunt left it there(its still up) and he idolizes JOHN CENA(wrestler)…and sometimes when were driving to work out he keeps pulling up his basketball shorts up little by little… I know this list is long bare with me lmao…and he is always standing next to me when I sit and kinda pushes his abdmen forward like he is secretly but delibritly trying to show me his bulge..he is hot and I like him but am confused maybe he wants to see if I react to the gestures to see if I am gay also???what should I do??? …ps he has a girlfriend and has sex on a regualr basis…and is a VERY gay drunk lol