Do you thinkk hes gay or bi....plzz help?

ok, there is this boy in my cl. He sort of likes me, but the thing is that I dont know if he is bi or gay. Me, im a biual male, and he knows this. So every since he found out, he always flirts with me and be doin stuff tellin me *** sit by him and stuff. So today when we were int he back of the cl room, he actually told me he wants to play with my dic* and then he grabbed it...and it was like a huge grab...then he was going to show me his, but this girl was being like totally nosey even though se didnt know what was going on....so what do you think...is this guy bein serious, or just playin around...even though I really dont think he is? But what do you think....please answer quickly...the bus comes soon..thanks you all