You are fooling yourself if you think you are actually making deposits into her love bank. Its not happening. Conversation IS what builds a R but the reason it worked when you first met was because she was not in a R with someone else. If she had been, your conversations wouldn't have meant squat. Your W has left your R. Your sympathetic, supportive ear is just showing your weakness right now.
You are making excuses for her when you say she can't help herself. Of course she can. She is CHOOSING to be in a R outside of your M.
If I'm hearing you correctly, you are saying that you are just going to wait around until the "drug" wears off to be ready to take her back when it does; no matter how long it takes. There is nothing wrong with that if that's what you want and what you are willing to do. My fear is that you will be seen as a doormat; a man that was willing to let his W walk all over him. And that is NOT attractive.
I kicked my W out of the house when I discovered the A. I THOUGHT we were working on our M but found out 3 months later that it was still going on so I filed for D because I was completely unwilling to live in an open M. But that decisive act is what turned everything around for us. I may not have been the perfect husband and had a lot of my own crap to fix but I refused to be treated that way and I made that VERY clear.
Me: 48 y/o W: 47 y/o Together: > 20 yrs BD: Dec '15, then S 2nd BD: Mar '16, then I filed for D April '16: started piecing