Is it appropriate to spend a lot of time with a guy who has a long distance gf?

My guy friend and I hang out all the time. (He's in a long-distance relationship with his gf) He cooks for me, we study together, eat together...We got drunk together. He calls me his best friend.I can't help but this this is not a normal platonic relationship..especially with all the ual topics we talk about. Like we talked about what kind of we both like and our ual experience. What is going on here?