Being single has nothing to do with working through your problems. in fact being with someone actually helps, especially if you trust them a great deal. the problem was Dora thinking singularly, she was thinking in terms of self, of only her. So she didnt see the problems, because to her, they were too weak to worry about. She started seeing them when Marten was around, but rather than take an active role and go "i dont like thinking like this. i have no reason to think like this. i must change this." she went "oh god, i need to leave him or else we'll just fight all the time because i'm jealous of everyone else even though he's with me of his own will."
That right there, is her taking a problem that truly stems from her, and making it everyone else's fault. She didnt break up with him for his sake, or because she was making him unhappy. She broke up with him because she was unhappy, and she saw the existence of everyone else in relationship to Marten as the source of her problems, when it was her that was the only true problem. She blatantly ignored that Faye not only was not constantly showing even slight interest in Marten, but she was actively and majorly crushing on someone else.
That type of reaction doesnt come from caring about others, that comes from caring about the self. i've seen people do that exact reaction all the time, and the one personality trait they shared was that they focused on themselves, and not in the way that they checked their movements and actions to make sure others got pushed around as minimally as possible. Now, with her being single again, the slight break in her mentality that began to appear because it was being pressured from all sides, is now going to repair, and reinforce itself.
Dora is effectively screwed, because Marten could have been able to end the cycle, but like we all agree, he's a bit too passive. Thus the key word is "could". He's supportive, but he's not pushy, and sometimes you need to be pushy. not a lot, but once in a while.
All that said, i'd like to see the Hannelore/Marten bond deepen some more. They always work well together. Then again...Hanners might Trance on Dora so...that might be an explosion that would be hilarious to see happen. But then again Hanners is working under Dora, and Hanners would probably be torn between the urge to defend, and the urge to keep a "normal" life...yet defending would-agh it's a cycle of confusion. Wow, Hanners is in a bad place.
Also, did anyone notice that after...uhh...what's her name. The one wi-Colette! Does anyone else get the feeling that somehow, Colette's gonna be blamed for this? Little Miss Bad Luck.