It’s complicated. “When two people love each other and still can’t make it work, that’s the real tragedy” – lines from Gone girl.
Mutual consent doesn’t mean hearts don’t get broken. It only means the pain of being together is far more than being away. :)
He did love her with all his heart, but she knew things wouldn’t change, so she chose to move on, and for the second time without saying Goodbye. I would say it’s heartbreak for him all over again.