I think I would just keep it to myself. I don't see that telling him would be of any benefit to you. Mourn for the loss and move on. I know that sounds simplistic but it's the only way I know of to get to the other side.
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Bipolar I, Depression, GAD Meds: Zoloft, Zyprexa, Ritalin
"Each morning we are born again. What we do today is what matters most." -Buddha