Im in a relationship but I still get excited when I see pretty women is that a bad sign ?

When I’m out and my girlfriend is not around I get really excited when i see very attractive women I get the same excitement seeing them like if i was single.When I was with my more attractive ex I would still like seeing pretty women but I wouldn’t get that excited. Im attracted to my girlfriend she has the body type that turns me on and we have a baby on the way but im wondering is my excitement tO other women a bad sign ?