How early can you fall in love? and how early is too early?

Hey there! I recently went on my first good date with a guy I've been friends with for almost three years and I'm really concerned with the way I feel after the fact. I'm not much of a romantic person but during and after the date it was pretty clear that we have undeniable chemistry. I can't stop gushing about it, literally I can't. I've never felt this after a date let alone with another person and I think it's way too fast to feel things like this. And it's not like I didn't have feelings for him before, I did but then he shot me down :( And then he fought really hard for me to agree to a date. Before the date he basically told me were exclusive and not talking to other people and I was like “okay”. I literally don't know what's wrong with me, someone talk sense into me please because it is way to early to even think I'm falling in love. or am I starting to fall in love? How do I slow it down, I don't want to ruin it.
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Update we’ve been together for 7 months now :)
How early can you fall in love? and how early is too early?
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