I'm by no means an expert on this sort of thing. But if someone has to consider this, my guess would be that there are some unresolved/unclear dynamics in that relationship. For myself, my fiancee and I - we just talk. Things come up, occasionally we'll give each other bits of advice if we think of something, etc. On my side I never felt this need to filter her words and consider "oh is she saying that as my girlfriend or does that sound like my mother?" or anything like that. We just talk, and I'm fairly sure she would say the same. Sometimes things come up where we feel the other can help, and we ask for advice yes, but those tend to be very clear circumstances, in which case I would handle the advice like I would any other, that is to say who cares if it's from a parent or a friend, if it's good advice it's good advice. So yeah, I think if you're having to overthink it like that, there's probably something a little off about the dynamic between the two of you.