I (25M) have suddenly fallen head over heels for my crush (24F)

This is crazy. It’s amazing how crushes can just spawn when you least expect it. I’ve (25M) known this girl (24F) for over a year and a half now, and we only really interacted when we were in the same space. The interactions were always sweet and fun, but nothing that made me really attracted to her (even though I always thought she was cute/beautiful). But then, suddenly, when I saw her at the same concert I went to, we chatted and had a conversation post concert. I don’t know what was going on, but we cracked so many jokes, had great banter, talked about getting coffee together, and even had what seemed to be very mild flirting. All of a sudden, my heart is skipping 2 beats at a time, I found my cheeks were flushed, and I couldn’t stop looking at her. The crush had settled in, and now, I cannot get her off my mind. I even wake up thinking about her. I just want to see her again, but she ultimately admitted to being a terrible texter. I’m hoping next time I see her we just get a coffee hangout planned in our calendars. But man…how do you go from not thinking about them at all to fantasizing the potential of being a couple in a matter of MINUTES? Crushing is weird 😂 what do y’all think I should do next?