As a happily married 39 year old I look at the modern dating scene with horror. I think that he probably doesn’t “just” want to sleep with you, he probably just likes having someone like you in his life. People can be complex, we construct these binaries that simplify things, reality is more complicated. If you enjoy hanging out with a person, do that. Don’t lead him on just to get to go on nice dates, and also be aware that he might be a pig that does just want to sleep with you. Maybe he mentioned going on trips to try to entice you into a relationship. Don’t get into a position where you feel like you owe him anything.

The age difference is pretty big but there’s a lot of loneliness in the world. So maybe talk to your mutual friends, does he have a history of chasing younger women?