I can assure you I am none of the above. We have a very open relationship where we often do our own things so please don't make assumptions.
It is a big deal to me because I don't get why she'd make up stuff. I haven't gone into detail, but the depth of the fake stories is what bothers me. Not just a passing comment but it goes on and on..

Yeah I get what your saying. I feel shitty for looking because I do trust her. Maybe I'm insecure I don't know:(

I get that but surely not to this extent

I don't know how to approach it, and the fact I almost sensed something was different beforehand and noticed the change in behaviour says there is something more to it.

OK.. why would she literally make things up about our relationship.. not just small things, for example she completely made up we used to live somewhere else and may have to move away again.. why would someone say that?

Your missing the point.. Read what I wrote again. I had suspicions and was right.. but I don't know what it means

There very good friends, which is great. But she is all she talks about.
I noticed she keeps her phone on her alot and curiosity got the better of me :/