Oneitis is more dangerous than anything. I have personally found that even after going through what was mentioned as the closing stage I float back into the beginning stages again.
Is there a happy ending? I have read unless you are an MPUA no there is not. I have personally hooked up with my oneitis, had her like me back and still not have a happy ending and I am in the same position as months ago (complicated situation but so are all oneitis cases). There is no doubt in my mind it is NOT worth it to worry about your oneitis if that is an option for you (translation do not let yourself get to that stage).
I think the worst thing about having a oneitis is that you cannot be yourself around them. You begin analyzing everything you say and everything you say is not what you mean. Using your PUA skills or even your normal social skills becomes so much harder. In effect you, the charming, cocky/funny, sexual, fun guy is no longer you.
There are ways around this but it is very hard to do (give yourself the "I dont give a fuck approach", give the girl the "cold shoulder", etc..) but like I said, it is not easy to do. I have been able to do it many times with a level of some sucess but obviously not complete sucess.
I am thinking of writing an article on oneitis, there are some good ones out there but I dont think they portray good enough stories nor describe actual field tested approaches to dealing with oneitis.
Good luck to all, hopefully you will hear from me soon.
-Attached is a link I take no credit for, Qlass wrote it a while ago, it is interesting and helpful. Hopefully if I make a new post it will add to this link and provide some more perspective on the matter.
a-guide-to-kicking-oneitis-vt33797.html