You don't want to be in bad shape when that happens. It's so that I look presentable when I meet my ex-lover or friends accidentally. That's why I tend to be careful about my appearance in general, trying not to put on too much weight. That's the kind of attitude people generally describe as vain. I'm always criticized for being vain.
Vanity is an important thing.
It means you care about what others think of you. It means you're aware of your relationship with others. I'm very verbal with people as well. One should never disregard the importance of pleasing others. That's why I handwrite about 200 postcards each day.