If that is how you see it mate then i believe you are for the time being doing the right thing.
To be honest for once i don't have an answer to your problem. Kills me a little bit because anything i can say to help would be speculating rather than offering any real advice as it sounds to me it could be a number of scenarios.
Answer me one question. And be honest with the answer please because depending on the answer it can reveal what/if any help i or someone else can offer.
What have you done in the last 18 months that may have caused her to think the way she is now?
Not an aggressive question, as
@Woolly Blue sated to me earlier in the thread, you do have to ask yourself that question. So if you don't mind, help us to help you by answering the question. even if the answer is nothing, or it is something negative then makes no odds, just narrow down any advice we can offer