My girlfriend compared me to someone else. How should I feel about this?

Recently me and my girlfriend were talking about working out and I asked her to rate me. She told me I was a 9 but I lacked muscle so I asked her which areas I should develop. She then said " well I don't really know that but I compare you to *name* today and he had muscles like a 10".
I have previously felt very insecure about this same guy She compared me to and I don't know how to feel about this. What should I do? How should I feel?
Updates
+1 y
She cheated on me with him lol
My girlfriend compared me to someone else. How should I feel about this?
Post Opinion