You realize you admitted here to giving him 5%. Many (most) people who own percentages of a company do nothing. They gave money or services at a point in time

You realize you admitted here to giving him 5%. Many (most) people who own percentages of a company do nothing. They gave money or services at a point in time for a percentage and that’s that. No additional work required. No backsies. Treat it as a life lesson.