She said I was "too fit"?

I'm a personal trainer and fitness is my lively hood. I spend hours in the gym everyday with clients that are trying to stay healthy.

A female I'm currently talking to said I was "too fit" and it made her insecure about herself.

I am not vain, narcissistic, or "jockey" at all.

I'm not THAT BIG either... if I had to compare my body type to anybody it would be similar to Brad Pitt from fight club.

I really don't understand what she meant when she said this... is there anything I can do to make her feel better?
She said I was "too fit"?
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