Who cares? I think the most decent way to move on isn't to ascribe 'evil' to either of you. Just call it 'incompatible' and move on. There doesn't always need to be a white hat/black hat in these things.
You know yourself. Look in your dark spaces and see what you could/should have done differently and learn. All any of us can do, really. Good luck, sir.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh