I am going to come at this from my own experience. It may or may not be true for you.
I think that you still have feelings for your AP. This is not at all uncommon, we go through a lot of justifying when we are having an affair.
I told myself stories that made me feel entitled to the affair. Things that focused on the negative aspects of my marriage. I also told myself things that made the AP seem better, like it was star-crossed soul mate, meant to be type stuff. These are stories that make it easier to do something we know to be wrong.
When you come out of the affair, there is a lot happening.
1. You feel flat because you are used to getting a lot of high feelings from the affair. The things that were making you unhappy before the affair are staggeringly worse, and you may feel like you can't even connect with your heart. You choose to keep escaping the situation by continuing the stories that are in your head about the situation. Keeping the fantasies and high feelings from the chaos flowing.
2. You continue to look for valid reasons to leave because you are still blaming your spouse or their attributes and tell yourself the story that it's impossible because it doesn't look like the other story you are playing in your head.
These are delusions. We see in our AP what we want to. We see in our spouses what we want to. And, I too couldn't deal with my perception of his lack of emotion. Most of the time what we are seeing is our own projection on the situation. The sooner you realize that your thoughts are distorted, and that some of what you are projecting are things you want to be there in order for you not to have accountability over your actions. It doesn't seem to be true, but I am telling you it is.
Read the article published by Dr. Frank Pittman called "romantic infidelity". Google it. The reality is he can predict with certainty the way a limerant affair goes because it's a typical psychological response to being in an affair. Your situation is not unique, or special. It's actually cliché and has been experienced by many people who walked your path.
The best thing you can do for yourself is to focus on working on yourself. The person you are right now will carry into your next relationship or into the marriage you are currently in should you decide to fix it. And, there is a lot there that needs fixed. Start with why you are unhappy, and what your responsibility to that is. Other people are not responsible for our unhappiness. We create our life and it's purposes. You lost yours but you can find it.
I am telling you this from the bottom of my heart, because I was you. A couple months out of the A, we were very much struggling and I felt really flat towards all of it. I worked on myself and learned that I held the keys to everything all along. That I needed to have boundaries so that I could protect my own happiness, and that I also didn't have to spend all my time trying to make others happy all the time. It goes way deeper than that, I am trying to keep it simple at this point.
I left this forum shortly after I came as well because I didn't feel any support. The support you will get from this forum is a dose of reality and maybe you aren't completely ready for it yet.
By the way, after working on myself, and believe me I was ready to run, and I thought I was head over heals for the AP....I am very happy in my marriage. It took a lot of work and dedication, but I feel like we both changed for the better. And, I feel like I was the one who really needed to change the most after all of it. I had to decide around the time you are at now to go "all in" and that meant aligning myself with a decision. I don't think the betrayed have to make a decision at the same time, I think my H was really a solid year before he decided that he would try R for real, but if it has any chance of working the person who cheated has to put all their chips in. And then align all the work, thoughts, behavior to go with that goal. The grass is greener where you water it.
But, if you can't do that, then let him go now.
[This message edited by hikingout at 1:18 PM, April 28th (Tuesday)]