When it comes to these 2 things:

The girl starts blabbering about her boyfriend. How he's
1) cute
2) an asshole

The girl starts blabbering about her problems.

Is it always bad to talk about this? and how do you avoid it? or is it more of an grey area between building comfort and the friendzone?

im really interested in this subject aswel, is it good or bad for your game to talk about her problems with her boyfriend?! plz help i could really use an answer really quick

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My mind have an idea of what i deserve - i will go beyond it

Id Look up Boyfriend Destroyer's I read some really good shit on my Android about them. Shame i dont remember and i'll have to right it down next time.

Id just act like i dont care about her Boyfriend or that she has one. One thing i do remember though is if she tell's you she has one or brings him up again. Compliment him, Not Like a Fag, But Like them together Like. . . "Oh You two seem perfect for eachother, This That etc..." It'll make her really think about him and her and show there faults in the relationship.

Basically you made her double check them both, and she might even start Bashing on her own BF, Dont Bash on him with her when she does that, Just Keep it going or Transition and leave that thought stuck in her head to think about.

And you stand out, how many guys acknowledge Girls BF's? None, But dont come off as a Kiss ass like "I want to be just like him vibe" talk about them both.

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RAFC , Progress is Great

And what about her own problems? How do you stop this? Or is this not necessary? As in "not being her therapist".