I have been with this girl for about 3 months. Recently I had sex with a chick from my university and I got reminded that girls can take a lot more pounding than that which my girlfriend was tolerating. This girl has always told me to go slow/be gentle and yesterday I decided to ignore that due to my recent reminder.

While we were having sex and I was picking up the tempo she began to cry all of the sudden, I stopped asked her if she was okay and what was going on, but she did not say anything, just told me to "please go slower, be more gentle". I do not think I was hurting her, it was more like she was feeling like my whore (like she was being degraded) kind of crying. After a minute or two it was like she never cried and we finished what we were doing.

Did not talk to her about that, she hasn't brought it up and it is like nothing ever happened. We had great sex the very next day, any advice?