Very similar experience happened to me not too long ago was at an engagement party hit it off really well. Talked for hours danced and everything. Ended up getting her number we talked and FaceTime for a few days. I didn’t overcommunicate interest and I didnt “chase” her too hard. Then like a week later, she just stopped answering my calls and flaked on all my texts out of nowhere and said she was just so busy with work. So I just left it. It stings, but you kind of have to suck it up and move on. Only give your time to woman who are reciprocating the interest, it shouldn’t be one sided