Talking with my GF earlier today about sex, and she said "Sometimes I feel like you and your ex had an amazing sex life and I don't measure up."

She is actually way better than my ex, but I don't want to tell her that and have her thinking she can quit trying so hard to please me. And I definitely didn't want to tell her the ex was better. I just told her "babe you make me feel great" and slapped her on the booty.

How would you have answered this ?