@imnotpainter@lemmy.world ^This is a solid and comprehensive reply, and I agree with all.

In regards to the last part, I think sexual intimacy can be okay at an earlier stage, as long as you ensure clear and honest communication beforehand about expectations and comfort zones. But as mentioned, considering the inexperience, caution is your friend. Do not rush; you have time.

Another advice is to be inquisitive: Ask him directly what his intentions are, and why he's infatuated with you. Perhaps also ask your friend's boyfriend about him, and have him tell his 5 cents both about this guy as a potential partner, but also as a person. It might come to light things like him being on the spectrum: Even seemingly socially adept people can be on the spectrum, and it only shows when they're in unfamiliar/stressful situations. This could explain his behavior as someone who just don't know how to show his affection, and (desperately) attempts actions he knows make people happy, like gifts.

I say this as someone who qualifies as a socially adept person on the spectrum, and I recognize this behavior.