I don’t know what to do about this thing with my friend

To give a quick summary, a very good male friend of mine recently started showing signs of interest for me and our relationship just took a sexual turn. I really like him, we just have awesome chemistry and I feel so good around him. But the sex thing has kinda left me unsure about what to think/do. To be clear, it was just a handjob, nothing huge, but it was a really sharp turn for me from the platonic nature of our relationship. Maybe because I have zero sexual experience? But yeah, now I'm just worried he was just into me sexually and that he doesn't share my feelings. In my head, if his feelings were romantic, sex would've come later. But we just jumped to that. I don't know where to go from here, if he does like me romantically, if I'm overthinking all this..