Piano, this is GOOD. This is so good. In my opinion. He sees, a little bit, what is happening.

It might be very painful to you because it's a 'goodbye' letter. But there is hope. There is the future.

You didn't ask, but how to respond? I would just say something like "Thank you, name" or "'Til next time, name"...

The less the BETTER now. He is fragile, grieving, and that is GOOD!!