Are you looking for suggestions on how to re-phrase the expression “I’m so sorry, I’m a idiot, you have every reason to be angry/upset/disappointed with me but please don’t because I made a poor decision or didn’t choose my words well”, or, something more imaginative like how to hire a pilot to fly an “I’m Sorry!” banner over his home or workplace when you know he’ll be there.
Personally if I would appreciate someone saying they’re sorry to me, I also want to see millionaire shortbread magically appear. Apologies are best not overdone. We are all flawed and it’s programmed into each of us to stumble through life making one horrible mistake after another . Treat your partner as you’d like to be treated yourself.