I'm not so sure that Marten will be all that upset with Sven about this... I could see him playing that angle... But I'm guessing that after all that has passed between him and Faye, he may see this as something that she just needs to deal with... Like was said in another thread, Faye knew this was going to happen. She went into a relationship with a guy who has sex with pretty much whoever he wants. The relationship she went into was a straight fuck buddy relationship. I considered friends with benefits but friends do things and Faye was adamant that they weren't in a relationship.
So I guess I think that in the end, this is still all on Faye. And with things with Dora teetering between okay and tense, I'm not sure even Dora would go overboard on Sven... She knew it was coming too... with Sven, it's inevitable...