Probably should've stayed lurking...
The reason finding who's to blame is useless in a scenario like this is because it doesn't answer any questions. We can conclude it's Dora, and so could all the characters in the comic, but where the fuck does that get anyone? Does it make a solution any more obvious? Only if you consider "DORA'S A STUPID BITCH AND SHE SHOULD BE ALONE FOREVER BECAUSE SHE'S STUPID AND A BITCH!" a solution. Which I don't. In fact, I don't even consider it an accurate statement.
Finding who's to blame should only go as far as figuring out who needs to take steps to fix it, not in terms of finding who to direct anger toward. Dora needs help to overcome the problems that are causing her to hurt herself and the people she loves. Full stop. That's the resolution. No sentencing need be delivered, no one need be doomed to another hundred years of solitude for their transgressions. The problem needs to be fixed, which means it needs to be addressed as "the problem", not "the list of reasons this reflects badly on Dora".
This sums up the situation quite accurately. As some of the posters have pointed out, Dora and Marten both have their own insecurities (Dora more than Marten, but still..), which should be identified and fixed, if they want to have any future on their relationship. The keyword is, as said many times before,
discussing, not pointing fingers who's to blame. It seems that for a change Dora admits being wrong (yes, i KNOW the bodylanguage isn't quite saying it, but i still think she means it), but the timing just
couldn't be more off. One of the worst things in this kind of situations is to rush to action without letting yourself cool down a bit, because people
CAN AND WILL be just as vengeful, petty and agressive as you can imagine, if given a chance to be.
As for asking, does the possible breakup make me sad? Yes it does, because despite their stormy nature of their relationship, think they complete each other. I find it kinda odd, that some people mistake "making an effort" to "being completely spineless". The easy way out would be the "screw this"-option, thou it wouldn't be like Marten to just give up, because even with all of the fighting, he genuinely seems to still love Dora. I am NOT approving the incident with private issues, that was DEAD wrong from Dora, but still, people do make mistakes now and then. They just have to ask themselves, is this worth it.
Hopefully my ramblings weren't too incoherent to read, i just had the feeling that i gotta express my opinion in this.
And skewbrow, goddamnit, now i got Placebo's Pure Morning stuck in my head nonstop, aaagh!
(woah, a wall of replies hitted before me, i just gotta learn how to type faster {or think faster})