Y'know, I used to be in the "Marten's a wimp/milquetoast/spineless" crowd, but after reading through the archives and seeing several instances where he DID stand up for himself, including clobbering a fake monk with a frying pan AND arguing with Dora over the whole Faye banging Sven thing, I've come to realize, he's just laid back. A true milquetoast NEVER gets angry, NEVER stands up for himself, NEVER argues with his significant other. He justs soaks up abuse. And really, would we care for Marten so much if he were a real whimp?
Nah, I think Marten realizes that if he marches into their bedroom being all confrontational, with both of them being as pissed as they are, things will just get worse. As it stands right now, this can still be fixed with some heartfelt apologies at least on Dora's side. But Marten goes in there with Dora still in a mood, having had no chance to cool off, they could start screaming at each other, saying and possibly doing things that CAN'T be apologized for, and then things will really go to hell. Can you imagine the predicament Faye will be in if that happens, if Marten and Dora break up over this? Can you imagine how horrible she'll feel? She ALREADY feels bad as it is! And her job may be on the line, she may have to quit even if Dora doesn't fire her, the work environment could end up being that tense. And of course her friendship with Dora would be over.
And Marten would be totally out in the cold, no Dora and no Faye either, except as a friend. He couldn't set foot in CoD anymore...it would just be a total mess.