Don't blame you for being spun by that convo, seemed like W talking in circles a bit. Typical WAS, say one thing, but then saying another thing that kind of contradicts that. Just letting out their mind content- which is confused, for the time being- but with all the chances of turning around! And definitely focus on the good parts of that convo, try to pass the rest off as "discontent". I'd agree about pulling back. More of the "your own life" stuff to peak W's interest.. Think it may have good effect in your sitch, esp seeing how you saw her reaction when you said the word "roommate". That was great! She's not expecting that, for you to make steps to "detach". Taking you for granted right now, thinking you'll always be there wanting an R and to do things with her.. I think it works well with WAS, when we let them initiate more of the time together. Acting like you're fine as things are now, especially since you are living together, you have that daily opportunity to show her the new, exciting you! The one who's meeting all kinds of new people, including women (just platonic, but the suggestion of "what if" does wonders!) and doing stuff without W. Like get her thinking about what you are up to?! Then, watch her interest grow..
Master the self-fulfilling prophecy.. Act 'as if' it's going to happen and make it be!!