My brother asked me for advice about a situation he has with his girlfriend. Basically his gf acts like she's attracted to other females, and told him today that she masturbated to the girl she saw on her dreams lol.

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I asked him why'd that make him angry and he said that she'd be pissed off if he has done the same and that she thinks it's not "cheating" if it's a girl on girl.

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So I just told him to withdraw attention from her and next soft next, because her rationale on cheating is bullshit. The thing about all of this he was legitimately pissed off, so I couldn't tell him to play along with it and get a threesome out of this(even though his gf told him she wouldn't do a threesome). Is my advice solid on this one?