#4. If someone forgets to invite them, they can still be friends.
That is so true. Women could probably learn from this in not taking everything so personal. I often find that if you don't make a really great impression on someone (mostly female, but not always) when first meeting them, it sets the tune for the entire time you're involved. They tend to hold grudges, if you step on their toes. Oops, no deleting or rewinding in real life. There's like this silent punishment of avoidance. It doesn't go unnoticed but then that is the point.
So very sad in so many ways.