You can't manufacture a feeling. Either you have it or you don't.
Love is a choice as crazy as it sounds. We choose to love. We choose to engage.
If you don't have those feelings I would suggest IC to figure out why.
I am sure much of it can be contributed to the A. It is hard to have feelings for someone who disregarded yours.
The fact that he is doing all the right things now may be a "too little too late" situation for you. And that is okay. You are also probably still gun shy (understandably so) to fully love or trust him. He's hurt you and that doesn't just go away. That is where the darned TIME thing does come in. It does takes time.
What in your opinion would make your marriage less empty or hallow? What would need to change?
I know exactly what you mean about being tired of dealing with it, trying to analyze it, figure it all out etc. So do take a time out. Tell yourself you aren't going to worry about the marriage for a week or two. It will be what it is and you aren't going to go there. The mental break you give yourself might prove to be the exact thing you need to see things more clearly of what and how you want your marriage to be going forward or if you even want it to go forward.
I believe most marriages go through peaks and valleys even if there isn't an A involved. Sometimes we love our spouse and others we want to punch them in the face. NORMAL. We can't be loveable or love everyone all the time. We are human.
Logically, it doesn't make sense to throw it all away. And that's what has me here. But there is no underlying want to be here.
Logic rarely has anything to do with feelings. Allow yourself to feel what you feel without conditions or explanation.
It's been 3+ years for me and there are still days I struggle with the whole ugly mess. Less time than in the beginning but it is still there like an annoying fly that just won't die.
Take a breath and know that you don't have to figure it all out right now. One day at a time and you'll find your way through.
Good luck. Hugs