Vanity and Expectations
I loved this flash, I agree with that people should stay true to who they are also when they're in love.
This doesn't mean that people should forsake themselves though. Self-Improvement stimulates your confidence, but it's important to do because YOU need it and not because you expect attention from it.
The most striking commonly accepted example of this is girls wearing make-up. I'm a guy, but I'd like to think most girls get a confidence boost from wearing it and that's a good thing, as long as vanity and expectations aren't the dominating factor of using it.
The thing is that most if not all people love acceptance and approval and achieving it can become the goal rather than the result of what you are.