The heart loves, whom the heart loves.

You can't sway it once it has set it's heart upon one desire or another.

No internal struggling, no talks of reason, no force can melt the iron chains of love.

The only creature that can break those chains is the person to whom the other end is bound; and only then when there is a flaw, thus far unknown.

If said person was merely to decline such throws of affection, the stubborn heart within your breast would continue in the pursuit, hopeful for change.

But flaws kill.

Our selfish souls see that if the loved one is tainted, then that filth must also taint our happiness, therefore we can let go.