So he takes the bus for a while, stops for a number of years, then starts back up again? Correct
Does he have a phobia or fear regarding riding buses? Yesish
Does something happen that causes him to no longer ride buses? Yes Does something happen related to his health? Yesish Or related to something with the buses? Yesish
Relevant what he does instead of riding the bus? Yesish, not so much "instead." Does he stay at home? No Ride other public transportation? Possibly, but mostly irrel. Use private transportation? Possibly, but mostly irrel. Edit: does he ever drive a bus? No
Instead of taking the bus, does Arthur do Y instead? Yesish, again not so much "instead." I would be careful in limiting yourself to just Y. But then he is unable/starts to dislike doing Y, so he takes the bus again? Yesish, explore.
Is Y taking another form of transportation? He switches transportation, but that's mostly irrel. Does he drive himself? Most likely. Does he then become unable to drive (due to reasons such as failing eyesight)? No Or does he view the bus more favorably Yes (due to reasons such as increased gas prices)? But not for this reason.
School buses relevant? Citywide buses? This Cross-country buses?