I'm sorry.

Ever been in a situation when u thought u were doing just fine for quite a while... thinking that u have been doing what you shud be doing very well... and then only to realise suddenly that you've seriously been failing very terribly and hurting someone without even noticing... and that things have seem smooth cuz that someone has been covering up for u and taking the brunt of ur carelessness and insensitivity...

It sure doesn't feel good. I'm sorry.