You have always been capable of leaving the person you've been with for a better life, if that's what you decide you need to do.
You really regret what you are about to do, but you value your happiness more than you value the happiness of your romantic partner, who can only cause you pain.
You've come to the conclusion that you can't spent the rest of your life being courteous to someone you've grown to despise.
You are like a lone wolf who commits to a single mate for the rest of its life. Of course, human life isn't that straightforward, and after picking this final partner as the one you'd 'ride or die' for till the end.
I mean, it's either them or you, and by the looks of things, all 'they' represent is a sickening takeover.
You've realised they've transformed into someone you despise and need to terminate things as soon as possible. The Sun's trine to the Moon is the time you muster the courage to take the necessary action.
Finding the willpower to do this has been difficult, and you're crafty enough to wait until you have a solid plan in place before you depart.
Your ex has lost all shred of decency or elegance and has become a brash, arrogant jerk; you no longer want anything to do with this person.
Because of the Sun trine Moon's emphasis on common ground, equilibrium, and tranquilly, you will find the inner fortitude to part ways with the individual who has given you so much pain.