So hey it's one week ago that I decided to end this all, because me and my one-itis have serious feelings for each other, she told me after 3 months she is really in love right now, but still wants me to give her more time, that she's able to break and end up with her present boyfriend, but I didn't want to wait that long for a chick, because as much as I believe that her feelings for me are honest, I can't stop to think that she messes arround with me.

So she broke up once with him, 2 weeks ago but took him back 3 days later, last weekend she told me that shes in love but needs time. I decided to break down all of the contact because this isn't how it works for me...yesterday she called, and told me that her love is honest and true and she cried, but still wants the time...3 weeks from now, and in cause of a Event we'll see each other for 4 days.

How do I get over this one-itis. GFTOW didn't got me anywhere, I fucked the last 8 days actually 6 different chicks, but it wasn't much of a help.

Any suggestions or other ideas on how to go on with this one ?

TL;DR, didn't care, but I did type this up for you:

It takes time. You probably have certain feelings and emotions which you have experienced while you were with her so the fact that she isn't there anymore effects the way you are able to act and perceive things now. The obvious answer is to stop being a pussy and move on but of course the more complicated answer is that it's not that easy, for reasons mentioned in this paragraph. Understand the reasons WHY you having oneitis are reasons that exist ONLY in your brain. After you get over this foolish state of mind will you finally be able to get on with better things in life. If it helps you at all just remember that A) she has you right where she wants you, and B) you will get hotter smarter more incredible girls if you are ever able to utilize the techniques discussed in this forum.