* Dudley is not a playable character: Dudley is a non-playable character (NPC) who serves as the game's antagonist. He's not designed to be romantically involved with your Sim.
* No marriage system in Bustin' Out: The Sims: Bustin' Out did not feature a marriage system. You could get engaged, but there was no actual marriage ceremony.
Therefore, you cannot marry Dudley in The Sims: Bustin' Out.