Apologise, but, Adult and learning and quotes and life apologise
The word sorry loses its magic when you use it too often, especially for the same mistake. The first rule of saying 'I'm sorry' is to rectify the mistake, and ensure that you never repeat it. You need to go to the root of the problem, amend it, and ensure that there will be no more future incidents of the same type. It's not easy to say sorry, especially when you don't think you are at fault. But at times, it is good to express regret to help calm things down.