How to mend a broken heart

First, take the two pieces in both hands.
You’ll find them discarded on the floor, next to where you stand.
Turn the pieces up and down,
Until a fit can be found.
Lay them on the table and get some glue,
The words spell ‘I love you!’
Glue part A to part B as clearly demonstrated in diagram c.
Give them a push and let them dry
Come back later, "had your cry?"
Now they’re stuck good as new,
But who to give the whole thing to?
I think… I think… I will try you…again.
But just like before, they are ripped and torn
And discarded once more to adorn my kitchen floor.