Can my straight friend have a crush on me?

Im a 22 year old gay man. Ive never really had alot of guy friends growing up because of that. I started working at my current job about 2 years ago. I became very close to my boss and we started spending alot of time together in and out of work. We started going to the gym together and he helped me lose alot of weight, taught me how to eat better and everything. Then things got a little weird. He knew i was having problems at home with my family adn that i wanted to move out. the apartments said that i would need a co-signer, which he agreed to be for me. he lives really far from our job and would stay in a hotel at least once a week. i told him he could stay at my place whenever he needed to, which he does. on our first night there together, i explained to him that i was gay and i wanted to make sure he knew who he was staying with so he didnt freak out. he said he didnt care and that he still loved and cared for me. so it was never an issue. i guess things got weird from there. we became so close that i started developing feeling for him. I told him that i "used" to think he was cute and that i "had" a crush on him before. which he just laughed about. he does things to me that just arent normal from a "straight" guy. like hitting me in a playful way...laying on top of me and pretending to hump me and junk like that. the thing thats weird is that he does it front of people who know my status, and they all think something is going on between us. i told them its not but that i wish it was lol! they said its mainly the way he acts with me. all my friends that have met him outside of work have asked me. a huge factor is that he is married with 2 young sons. he has told me that he doesnt love her and basically stays for this kids. he always talk about girls and stuff but its different when were just hanging out alone. i am madly in love with him and some people at work know it. they all tell me i should go for it cause maybe he's just scared of his own feelings cause its something he's never thought of before. He is older than me by almost 15 years. but we get along so great. he even asked me to spend an upcoming holiday with him and his son. im scared to tell him how i feel cause im scared of being rejected. especialy cause this is the first time ive been in love. people tell me that he has to know that i have feelings for him and that why he does what he does to me. but if thats true...and he really is "straight"...why doesnt he leave me alone? i know he doesnt have any friends and he tells me that im all he has to talk to. i dont mind listening to his problems. i wish i could do more to help with everything. am i crazy? is this an impossible situation? can he really have some kinds of feeling for me? or am i stupid for even considering this? I NEED HELP!!