Triumphing over adversity?

I noticed the other day that my pear tree, which has some rot and has been severely pruned back, has burst into bloom:

It's good to see that the old tree (it's over 50 years old) is still flowering, and will maybe produce a few pears later on. My cats are watching the birds fly in and out of it, from the safety of the kitchen (safety for the birds, of course), the garden is full of things going on.

These things usually bring me a feeling of joy....but somehow I feel oddly detached from it all.
Life isn't the same without that special, much-loved person to share it with.