Don has been married to Caleb Vatore in my game for the past couple of years. At some point, he stopped complaining about commitment issues. He's the brawn in the relationship while Caleb is the brain. I've also had him father 20+ kids with both Caleb and a bunch of different female Sims over the course of time. I can't find a career that truly suits him, so he usually stays at home and fixes things, tends the garden, and beats up his punching bag regularly. Oh, and makes sure Caleb is in a good mood. I view him as a pretty simple guy with little more to him than meets the eye.
https://i.imgur.com/QzNBKrX.jpg