Getting the shit kicked out of you by love

Why does this have to be the case? Really.

I mean, shit fully launched across the room. Heart a tattered mangled mess on the floor. Stepped on and trampled by the heel of a shoe.

There you sit on the floor, unable to walk into your own house, uanable to take your jacket off. And you cry. And cry, and cry.

You cry to yourself, you cry to God. You cry for the good, you cry for the bad. You cry.

And you hurt, and you sting. You want to throw up but can't.
You feel stupid and angry and start to hit your fists on the ground.
And you pray to God to make it all go away.

But why? What have you learned?

Riddle me that.