Once dumped a woman a few years back, who clearly was all exclusively into favors that I could have done for her if anything else. It suddenly dawned on me and was so obvious, that I called her out on it upon of which she instantly referred to shame me big time to make me "man-up". In the end I didn't, walked away, never looked back and never felt better than on this day...
...oh erm and there's another one: I broke my mum's heart around my pre-school age and yes, she still struggles on that one to this day...