What if I'm not satisfying him...?

Okay so basically, me and this guy at my school had a thing last year and it ended pretty abruptly and coldly towards the end of the year. I think the main reason was because I wasn't ready for anything sexual yet (it wasn't him who even asked me if I was up for it, he asked through one of our mutual friends), and I was just kinda flirting with him a lot. We didn't even kiss, though I wanted to! So over the summer we weren't in contact at all, but now that the school year has started, we've been pretty flirty again and apparently he's "caught feelings" again, and may be looking for something serious. Our mutual friend told me that he doesn't want to get bored with me this time though, most likely meaning he will want to do stuff instead of waiting. I'm nearly 16 and I'm not sure if I'm ready for full on sex or even blow jobs yet, but I do really have a good vibe and feelings for him. I don't want to be annoying and say that I won't have sex yet because I'll seem like a baby and I don't want him to get bored with me....help please 😕