He was flirting and then suddenly stopped?!

So 25F I’m friends with this guy for like 3 months now, and we’ve spent a lot of 1-1 time together. After our last hangout, things got a little steamy / flirty on text and he popped up the question- “what if this can be something better?” (Implying on romantic relationship)

We had that whole conversation and then post it, I’ve been a little flirty too but he just DOESNT GET IT??? Or idk if he’s avoiding me.

I sent him a “cute” (NOT sexual) photo of me and all he said was “nice.”

I don’t know if this a big deal but I’m confused and a little upset because everything else is good between us.