Typically, time is spent observing situations that make someone uncomfortable or upset then considering different options as to why. It can be pretty difficult to see the root of your issues if you're too close to them. Talking them out allows the therapist to see things from an objective standpoint and make connections that you otherwise miss because when you're in an emotionally elevated state, it's hard to think clearly. So, if Sven was mentioned by Dora a few times when she was talking about negative situations, the doctor could note that and just sum up what was said in a more succinct manner. Then, get her thoughts on it. Sometimes they're right and sometimes they're not- but it's up to the client to give their input. If Dora didn't believe that Sven really was the root of her issues, she probably would have said so (at least she would have if she's taking this seriously, which I think she is).
Maybe Dora is looking at Sven's approach and seeing "easy come, easy go"...it wouldn't be that difficult for her to see his situations and convince herself that for her, everything is incredibly difficult. Often, those of us with anxiety end up creating situations out of nothing at all because we're so convinced that "that's the way it is". Maybe she's got it ingrained in her mind that for something to last, you have to overcome obstacles- that nothing easy will ever work out. Hence, the self-sabotage.
She may also consider Sven's approach to be the one in place by most men- so if something seems too simple, it must be because the other person in the relationship is hiding something. We also have to consider though, that perhaps Sven has some deep seated issues of his own. Maybe his tendencies are caused by his fear of commitment- it's hard to be upset when something doesn't work out if you're not emotionally attached to it in the first place. He doesn't care about the songs he writes, doesn't care about the women he dates/sleeps with....because if he were to face rejection in regards to something he was invested in, it would be much harder to get over it.
...just my 2 cents....