Moving fast feels like chemistry. Sticking around is how you find out if it was.

Speed is exciting and it proves almost nothing. Two people can talk until three in the morning in the first week purely because everything is new, and the rush of that is easy to mistake for a match. What a match actually looks like only shows up later, in ordinary weeks, when there is nothing novel left to run on.

Let something good go slowly on purpose and see whether it survives being unremarkable. Give it a few quiet weeks before deciding what it is. The excitement is not a lie, it is just early, and early is not evidence.