Give him all the info, let him decide. Tell him that you're feeling a little giddy about him (no need to go into the exact number of butterflies and make yourself *too* vulnerable, but acknowledge it), and ask if he'd like to go a little deeper with you (more romantic dates? it'll help to think about exactly what you want) but tell him it's cool with you if he's not in the same place as you right now.
Or, say nothing, just try to shift your focus and break the NRE, whether via other activities or by dating.
I like option number one better -- go communication! -- because maybe you'll get what you want that way, but either one will help you shift away from this pattern where you're super focused on him and he's not giving you what you need in return. One-sided NRE is no good for you.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.