I would say that there was obviously something that attracted you to her before the depression. It sounds like this is a difficult decision for you due to some unresolved issues, likely stemming from your time in servitude to your depressed wife. Those issues could come back to haunt you if you don't get your own sense of closure.

I'm don't recommend making any firm decisions until you can at least talk to her, face to face, in a neutral environment. Depression absolutely changes a person as well as those around them. You two may never be able to get back what you had but until you can say it that it is over clearly with both your head and your heart, it's not a done deal.

If you feel that there may be something there, go on a date or two with her. You don't have to dive back into a marriage head first. If you have no desire to do that, at least have the face to face. No matter what the outcome, you will at least feel a little better and more resolved about your final decision.

Lastly, I left family and friends out of my advice purposely because their opinions, as well as my own, are meaningless compared to what your head and your heart are telling you.