Am I on the right track? (2)

[MrBond]

"Since she never complained and never answered me when I asked, though, I have nothing to go on in that regard. I have been self-reflecting and working on the faults I can identify on my own."

She probably did tell you or complained in the beginning, but you either blew her off or didn't think that was she said was important to her. It's not up to the spouse to be a better communicator, it's up to you to be a better listener. Just because you didn't think there were issues, doesn't mean that she felt the same.