If it is what I have, delusional dissorder, it is not something that will just go away one day. I don't know if it's an option, but if you tell her it's something she can get help for, maybe she'll go. I know therapy has been helping me a lot. I am also taking medication. (which is also great) My shrink tells me it is very rare, and mostly affects men, but I think it is a lot more common than he thinks, people just don't seek help. But I was at the point of losing a great guy, and to be honest, I'm tired of feeling like the ugliest female in the world every time I watch tv. (or step outside for that matter). You sound like you still really love her and I hope you can get back together.