I just wanted to stop by to say that I find you to be a very intelligent, very insightful guy. I think you have handled your situation very well so far. Given what I have seen you post in your own thread and to others, I would suggest you put any decisions on hold until well after the holidays.
It is perfectly natural to feel how you are feeling. I will tell you something my IC said to me and maybe it will bring you some comfort. He told me not to confuse getting stronger with no longer feeling bad about the situation. You see, I asked why I am still crying so much and still feeling so sad even though everyone around me keeps telling me how much stronger I am getting.
He reminded me that one can get stronger every day and still grieve at the same time.
That is my very long-winded way of saying, do not make decisions about your relationship until you are sure of the source of the feelings. You have indicated that you may be going through the mourning process, so I sense you are already seeing what I am saying. Just wanted to offer that thought to you.