Just because it was never voiced in a strip doesn't mean it's not a possibility. Dora being an ambitious business owner should be somewhat upset with her boyfriends total lack of direction and motivation to improve himself. Not to mention their relationship was founded on Marten striking out with Faye. Are there any ladies reading this? Do you consider Marten a guy you'd love to date?
All I'm saying is that Marten isn't much of a catch in my opinion, and until he decides to do something, anything with his life, then any breakups he has are justified by the other party.
I am a female person who sometimes dates male persons. And actually, yes, I would consider Marten a good catch. He's generally honest, he's good-hearted, he knows how to apologize, he is aware of his own faults and tries to be a good friend and partner. He shows concern for others' feelings and is pretty sensitive to other people's wants and needs. While he isn't very assertive, he also usually isn't passive-aggressive, either. Sure, he might be frustrating to deal with at times, but he's usually pretty happy to go along with the flow. I have a fairly strong personality, so this arrangement sometimes works for me.
Of course, I'm not Dora, so the point is completely moot - I'm just saying that lacking direction isn't necessarily what everyone considers a dealbreaker. I don't really consider Dora that much more driven than Marten, though. Yes, business-wise, she has shown good personal commitment and whatnot. She has her own business, which is a successful one, but what does she want to do with it? Is she happy where she is? Unfortunately, when it comes to her personality, she blocks out things she doesn't want to deal with. That, to me, is why I don't like her that much. Not because she's a terrible person or anything (she clearly isn't), but I feel like she acknowledges her problems and then does very little to solve them while simultaneously criticizing other people's approaches to problem-solving. I find that personality trait frustrating in a partner.
But hey, this could be a beginning of a wonderful, assertive Marten. Cheeseburgers and haircuts. But no meat-burps in the barber's face. A thoughtful decision.