he won't stop asking for nudes?!?

so I started talking to this boy a while ago and we only talk over text so we never met in person. I like him a lot, but I don't know if he's a fboy or what or even likes me back. but yesterday when we were texting, we were just trying to get to know each other better and all of the sudden he asks if I've ever or will ever send nudes. so I thought that would be it and he'd stop after asking but he kept asking frequently through the whole time we were texting. the answer I have him was like that we didn't know eachother that well. so then he kept asking more and more questions to get to know me, and he kept asking "so do we know eachother well enough now?" and "I think we're pretty close now". so I just don't know what to do bc I like him and I just don't wanna let us drift away