The question was: How is life going for you, besides writing?
This sentence gives the impression that it comes well into a conversation. That the questioner specifically singles out 'writing', and asks, 'apart from that, how are things going?', suggests that the person being asked has just confided that he is having some trouble with his writing, such as writers' block, or that his publisher considers he needs to make major changes to his latest manuscript etc.
The questioner is then just asking about 'how things are going for him generally'.
the answer : Passably well. Classes are fine, but growing increasingly tired of Boone. How about you?
The two most common answers are "Fine" and "Not bad", which for most of us, is what we can expect in living life. That he says "passably well" suggests he is feeling down about things, and that 'passably well' hints at this without wanting to complain too much.
If 'Boone' is a place as you say, and the sentence is, "Classes are fine, but I'm growing increasing tired of Boone (College/University/Military School), then he is indicating some dissatisfaction at work (some conflicts with staff, or the politics of the place), or is feeling restless and it's time for new challenges.