I like this boy but i don't know if he likes me back, help!?

so i like this boy and he was at my best friends house a couple times i was there and when he was there we chilled a lot and he would always sit next to me on the couch and stuff and fell asleep next to me but i don't know if he likes me back, and i wanna get his number but i don't know how to do that without seeming overbearing, can you help me?!