I mean I appreaciate the sentiment. He's always been really encouraging and I owe him a lot from a career point of view. He's given me a lot of opportunities that I may not have otherwise had.
That said, I am planning on leaving in nine months and comments like that make it much harder.
But I do appreciate the words. My primary "love language" is Quality Time and Encouraging Words. Especially professionally, encouraging words mean a lot to me and it was nice to hear it from him (and have it confirmed by my current boss).