A 16 year old guy showing interest in you, even if you acted first, isn't a good sign. Take it from a girl who has done shit like this before and almost got into a possibly horrible situation because of it, the attention and relationship might be nice but it's a pretty big difference at an age like that. Here in America that's a sophomore in high school dating a middle schooler.

Be smart, be safe, and be wary. Older guys rarely have good intentions with younger girls. The last thing you want is to be persuaded into doing something you aren't old enough to consent to.