I am aware this is typical for men, but has this happened to any red pill ladies? I am so confused right now.

I found a great guy and we recently became exclusive. We had sex for the first time a few days ago and it was really nice. I felt like maybe he could've attended to my needs more but also realise that it was the first time so it'll probably get better.

However the day after I felt really horrible and ever since I have had zero interest in seeing him. Already canceled one date with him and noticed I am feeling like dating other people... Is there a way to fix this? And how to ensure this doesn't happen again?