So basically I started seeing a girl about 4.5 months ago. It took about two weeks until she finally put out (she was a virgin). Since then, for the next 1.5 months, I was able to fuck her hard and fast without even thinking about cumming with or without a condom. Keep in mind that during this time we were just FWB's. Around Halloween I came over and we had sex. She told me she was going to a Halloween party later that night with 2 friends. However she subtly didn't want me to go and it bothered me to no end about it. Days later I eventually realized that she honestly had no reason to invite me since we were just FWB's. Regardless I was a little butthurt and it effected me mentally but I didn't show it.

However, a few days after that "event" I could no longer fuck her for an hour or more like I used to. I mean sometimes I can still go maybe 30 minutes of straight fucking but I'd have to slow down every now and then or else I'd cum. The shortest I lasted was about 4 minutes (lol). The sex is pretty kinky and I am very dominant. Tie her up etc.

We have been exclusive for 1.5 months now and how long I last is really random. If I don't wear a condom, I'll literally nut in a minute. I don't understand how I've changed over the early few months.

I hope this is the right section. If not I'll proceed over to /sex/.

Does anyone have any insight/advice?