I’m not sure that’s true, though.
Being the picky auditor guy I am, I think this entire discussion comes down to what you mean by “Dave would not ever forbid me.” Actually, I suspect Dave forbids you from doing many things by implied consent, and vice versa. My wife and I are the same way, I think, as you; we never yell and hardly ever argue, and I don’t recall either one of us ever telling the other “You may not do X.” But there are, obviously, some things I “forbid” her from doing by unspoken agreement:
- Sleeping with other men
- Gambling away our car and our house
- Skinning and cooking the cats
Okay, #3 is a little silly, but #1 is very important and #2 is, too, as well as any number of associated behaviours that would destroy us financially - for instance, I would be irate if she were to quit her job and lay around the house doing nothing. And vice versa.
Those things don’t need to be discussed much in a healthy relationship. The subject in the OP, though, is very specific in nature and is worth discussing (as it seems they have) and I can understand the boyfriend’s position. Saying “I cannot accept you doing something that will cause me tremendous emotional distress” is reasonable.