Does my straight friend like me?

I have a boyfriend, but he's very jealous of my straight friend, who he claims flirts with me all time. I hang out with my straight friend often alone and he recently asked me, "does your boyfriend not like me?" I shrugged it off telling my friend, "he's just overprotective sometimes." Then we continued on having a smoke together,, playing music and hanging out. He then wanted to show me a funny video on his phone. We were both seated on his couch, and when he came over to showed me the photo he was basically in my lap. I had one hand rested on the back of the as if to put around someone and he sort of slid in. Does this mean anything? Does my boyfriend have a right to be nervous? Am I overthinking it now?