Best friend, why is he doing this ?

So I’m not out and it scares me to I’m not ready.I believe a lot of people suspect in gay, within my group of 4 mates from listening to them they generally make anti gay comments etc or take the piss.I’ve never had a girlfriend and this is being noticed etc, i find it embarrassing.My best friend however (who I presume must know) who from the past had always been with tons of girls, but never in a relationship ship even tho he is stunning and could have any1 he wanted.I have Managed to put any feelings for him away and respect him a lot so would risk that. However he has begun to stay over a lot and when sleeping it’s like he purposely will wear only boxers and make jokes about having sex etc.. on numerous occasions we have been drunk and pretending to be sleeping he has been lying all over me, cuddling and is obviously coming into me. Then just flips over and then some time later starts again. He has been erect also.He jumps to my defence and tried to change subject if sum1 makes gay jokes or whoever.What is he playing at? He definitely is the most caring person in my life and I can’t even come out to him but is he possibly gay/bi, is he teasing me... it’s just frying my head