All except 3 & Better than "Learn from the mistakes of others." Better than "There is no 'We'. you (individually) have NOTHING to do with their success or failure" Solid advice - I love this. (Hate the typos, though.
If a person wants to be a part of your life, they will make an obvious effort to do so. Think twice before reserving a space in your heart for people who do not make an effort to stay. Must remember this!