Feeling like I need to fall back

So I’ve been seeing this guy. Everything is great. But I’m starting to develop feelings for him very VERY quickly.. this doesn’t happen to me often so I know it’s real. I’m very picky and have walls up most of the time. With him I let them down, hesnot shown me any red flags, he has been nothing but sweet and kind to me. But no I’m feeling like I need to fall back. I’m starting to freak out. Like I’m starting to text him back slower, say less things. I’m fucking losing my mind because I know that I will fall for him fast.

What do I do? I don’t want to ruin this but ugh