Be a fountain, not a drain.
I read this somewhere this week and I can't remember where, but it resonated with me. We all know those people who are drains in our lives - you part company and you're exhausted, even though it was only half an hour. Everything is always a drama with them and there's always something going on.
Then there are those people who buoy you up and refresh you. You can spend hours with them and still feel energised when they leave (yes, even us introverts!). They build you up and nurture you.
I know which type of person I'd rather be.