I let my crush on him go too far...so much for not getting my hopes up.

I haven't been in a relationship in years, or even dated really since. I just generally don't like anyone that much. But over the past few weeks I've developed the biggest crush on this guy I'm doing a community project with. I feel like a teenager, I don't get crushes but this is bad. I've been hurt so much that I can usually avoid this but it doesn't seem to matter this time. We flirt like crazy most days, but some days he just doesn't seem into it. But I can tell he's had a rough day on those days. He usually even says so. I have that "can't keep my hands off of you" feeling, but I have to because that'd be weird. And I don't mean that sexually. I just mean like I want to hold his hand, or touch his shoulder, or put an arm around his waist. I can't imagine the relief I'd feel if I could do that. I let my hopes get up because I've been reading into the things he says and does, but ultimately there's a part of me that just knows he doesn't like me that way. He couldn't. I couldn't possibly imagine him feeling this way about me or surely something would've been done about it. Our project is almost over and we'll go back to never seeing each other. I plan on asking him out before that happens, but I just don't think I could bear it if he says no. I know that's dumb, believe me I've been Miss Independent for years. It's just been so long since I've felt this way it almost feels like a brand new feeling. The last relationship I was in began at 15 and lasted until well into college, and that was a couple years ago. So I guess I'm feeling 15 again. 🤷‍♀️