Do I wait for him to ask me out (he is definitely interested)?

This has been such a slow burning situation, that my close friend calls it "almost a rom-com in real life". It started off unknown and we were both unsure about each other. But we felt this instant click

Both me and this guy (both in our early 20s, which explains the nervousness) are on the same wavelength. I cracked a morbid joke that made him smile. In response, one day when I didn't notice he was around. He made a joke that made me laugh, I turned to look who said it. He was already looking right at me.

From then on, he would frequently find excuses to strike up conversations during office hours. Just tons of cute situations that left me realizing, holy shit... I'm falling for him. Like seeing him play with dogs, or when he sees I'm tired and wants to help. I feel everything through his actions. It's like he became happier and charismatic, and I feel more productive and confident.

I think what made me realize it was extremely mutual? Other people. The others would ask him why he was always around. This week, his friend (I found out) has this constant smirk/wide smile and would talk to me or ask if I needed help. I think even the professor seemed to be in on this...

To be honest, I'm not sure what to do. I made a few moves here and there. Should I wait for the guy to make the definitive decision? Or should I secretly slip him my number? I feel so nervous and don't want to ruin it!!

Do I wait for him to ask me out (he is definitely interested)?
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