Thanks to Patricea Chow for the following words of wisdom:

sometimes people do realise their 'mistake' but find it difficult to apologize. after all, hasn't it been said more than once that "saying sorry is the hardest thing to do"?

we all fear how the other person reacts:
best scenario: 'I forgive you'. u heave a sigh of relieve
i-deserve-it scenario: 'after all u did, u expect me to forgive u so easily?!'. he/she is still mad. fine.
worse scenario: 'life goes on it was part of the learning experience'. so, r us till mad or hv u forgiven me? there's not resolution!

and it's this fear stops people from apologising.

I never realized how many people are reading this blog... I'm flattered with all the comments, humbled by the words of wisdom, impressed by the quality of readers. To readers, commenters, and people who may have adverse reactions, thank you! I appreciate each and every comment I get.

Oh, and to make things clear, I've forgiven but I don't think I can forget.