I am pretty sure I am going to get hate for this but year lessgo

I have a body count of 9 and nope no stds, I have taken my tests, I like to make sure the gambling I do is safe.

So what I wanted to ask is, is it normal to get turned of while having sex for a really long time?

My ex and I were in a relationship for about 3 years and it was a LDR, we did the deed only when she used to come to my place. For some reason, when we were doing it for the last time before we broke up we went on for an hour and during the first 30mins I was going strong, no condem, CNC, the classic dom/Sub (extreme) was on and it going good but later on it didn't last, like it wasn't letting me be turned on. I went from a 12/10 to 6/10 and I can see the changes, I clearly had to fake my moans because I didn't want her to feel bad. I had to go on with a 6/10 for the rest of the time, we went for a few more rounds but because we rarely meet.

The relationship was very toxic tbh and eventually I broke up after all the emotional blackmail and stuff but it's still stuck in my head about why I got turned off so much that I had to fake.