I'm Sorry should be the peacefully and polite word to use to settle a dispute or when you're wrong no matter the circumstance but this particular one goes to all the lovers and the lovers again... Please learn and be humble to accept your mistake and fault but don't forget to apologize, simple say I'M SORRY and please forgive when he or she apologize, no human is perfect but you can make the person perfect to your own suitable taste.
Learn to be polite but don't repeat the same mistake.