I’ve seen examples of this in TV shows as well. Being toooooo good to someone can also mean that you’re bending over backwards to do anything for them. You may not even realize that you’re acting like a pushover or a doormat…and these two qualities (which are like trying tooooo hard to please someone) are associated with low self-eteem/desperation/neediness. Which turns people off. Showing confidence is the opposite of these qualities…it’s a self-assuredness that may come across as “mean” but it isn’t…and attracts people.