Overheard my gf of 3 yrs (we are early 30s) telling her best friend that some guy in college was the best sex she's had and that they had the best chemistry. I confronted her and she said it was mostly the excitement because it was really wild and they had sex in crazy places and he would make sure she came with a vibrator and that he lasted pretty long. They were basically hookup buddies for 2yrs in college and he was in a relationship with another girl so my gf was basically his side chick lol. She said our sex at first was just as good as the sex with this guy from college but over time it hasn't been as good. I've been working on trying to improve the sex and I think it's working, but I still feel pretty bad about the whole thing. Was wondering what you guys suggest?