Ok, so for what its worth...its not a lasting obsession. Part of the reason it hurts so bad is that your feelings were and are real. However, on the other side it was an act. This is why it stings and hangs on you so bad...your ego cannot accept it. Now when I say your ego I am not singling you out...this goes for everyone. Your mind cannot comprehend the atrocities. Your mind is still trying to make sense of something that doesn't make any sense. Its ok. You are not behind the 8 ball. You are still healing. Your feelings were intense. So when the feelings are that intense on the positive side what do you think happens on the negative side? My point is...don't beat yourself up.
This is still normal. Everyone has their own process and some take longer than others. It just is what it is. So to answer your question which you kind of answered yourself...yes just wait for more time to pass. However, a suggestion...quit trying to be so scientific about it. You cannot make logical sense out of this complicated disorder. There are so many issues that could be at play.. An attachment issue, PTSD, Fear of Intimacy, etc. You just have to feel and let yourself process it. Hell it may still bother you from time to time moving forward...that is ok, but don't let it control you. Just monitor where you are at. There is no one size fits all. You will find your own way and do it in your own timeline.
Be kind to yourself. Continue to vent if necessary. I for one will pay attention and listen. Going through this sucks...there is no sugarcoating it.
Now keep in mind...if you decide to continue to vent and if I am sensing it necessary I will provide you a swift kick in the

$$. The time to truly take back your life is now (mentally). As I mention to everyone I help here on this board...please focus on coming from a place of power. Think abundance. No more thinking from a place of weakness, desperation, or scarcity. Want Better, Expect Better, Do Better! No one controls you but YOU.
Cheers and best wishes to you!
-SC-