OP, I am truly very sorry to hear about your diagnosis. ❤️🩹
However try not to dwell on the demise of your marriage & instead think of your children.
Your time was not wasted since you now have children.
Trust me on this >> what comes around definitely goes around & karma is a very real thing.
In the meantime try to focus on your health right now vs. seeking revenge.
Seeking revenge will only interfere w/getting treatment and will only make your life worse.
Focus on only ONE thing right now & let the other chips fall where they will.
Wishing you all the best!