What does absence make the heart do?

no it doesent from tom wise

Absence does not really make the heart grow fonder. Absence usually makes people forget the bad quicker than the good. People forget why they broke up and wanted nothing to do with each other ever...

you don't know what you have til it's gone

Because they want too

First of all, it's "Absence makes the heart grow fonder." Second, it means that lackk of being with someone makes you miss them and in turn makes you appreciate them.