I recently had my first same day lay, and it was fantastic. But now I have been trying to get this girl out on a date again/come over and she is being goofy as hell. Taking 6-8 hours to reply to my texts, very short replies, playing hot and cold, cancelling last minute, saying one thing and then flip flopping the decision... The hookup was okay but not super great chemistry. It's bizarre, especially since she agreed on the spot that we could hang out at her's in two days (during the first date).
I don't think I've been overly needy or beta to turn her off since.