Let's go over who's been affected by this, assuming it stays this way.
Sven is going to have a talk with Marten, and it's through him that we're going to get to see Dora's frame of mind. After all, she's already talked to him, as we can see from the coat. I can see some resentment between Marten and Sven if Sven helped coax Dora to this conclusion. On the other hand, I think it's more likely that he tried to stop this from happening, and failed.
Faye is not going to be happy, although no one else will blame her, as it has been acknowledged by everyone that Dora's fears are irrational. I can see Faye cussing Dora out over this.
Angus is going to be worried about Marten being a free agent now. After all, Marten's a single guy who liked his girlfriend, and is currently living with her. All of those are going to be warning bells. Angus isn't insecure, but I can't see him going along with the flat set up the way it is at the moment. Faye will have to move out with him at some point, preferably sooner than later.
Hanners is going to be upset over the turmoil, but she won't be overly hit by the fallout. I think Hanten is the most likely pairing now, although that's not saying much. Expecting it to occur in a few hundred strips, minimum.
Marigold is unaffected.
Tai might be a potential love interest for Dora in the future, but I can't see it happening in the next 300 or so strips.
Marten himself looks to be going full BSOD. I can't see him functioning particularly well over the next few strips. He may be told that this is what he really wanted by Faye. I suppose we have to see a bit more of him than the current two panels to fully find out though.