I sorta agree w/ that post you had, where it said that:
"Sometimes you hold on even if it's painful. Just because the pain of losing somethng important to you is a much worse pain to feel."
But when you think about it, it's better to accept letting go of that important thing because even though it's way more painful to let go of them, that pain is only temporary, and holding on to them not only hurts but that pain lasts as long as you keep them w/ you.