Two scenarios.

You are in a LTR and you both enjoy each other.

In the first scenario, when a discussion about exes go too much into details, he admits that you're not the best in every aspects he ever had in bed. He is respectful and show lust towards you, but you know you're not the most beautiful girl he ever had or, for example, not the one with the biggest rack or the sexiest body. How do you react to that?

In the second scenario, talking about sex and what he likes, he hints at the fact you're not exactly the best at a specific sexual act you two have already experienced many times. Maybe it's oral, maybe it's a specific position. Other girls were more kinky with him. How do you react to that?

A similar question has been posted geared towards men.