I think he didnt ask a question so no response is called for. I would say nothing. If that feels rude, then "thank you for your message." Maybe. He did not do anything that merits much gratitude, but he displayed a little empathy, which is good.
Adinva 51, S20, S18 M24 total 6/15/11-12/1/12 From IDLY to H moving out 9/15/15-3/7/17 From negotiating SA to final D at age 50 5/8/17-now: New relationship with an old friend __ Happiness is a warm puppy.