I wish people just knew how to say "fuck it." more often.
Someone's talking behind your back? Fuck it. Who cares?
Someone ditches you. Why get mad at them? You're still going to be their friend afterword. Just save the time and save yourself the time of being pissed. Fuck it.
Your significant other forgot your birthday. You really gonna break up with him/her over that shit? No? Then stop being pissy and fuck it.
As humans, we dwell too long on the past. If someone fucks you over, why bother even getting mad when you know you're going to forgive them?