S,

Man I really feel for you because I think you’re a good dude who came down with an unfortunate illness.

People typically end a relationship for one of two reasons. Loss of attraction or because they can’t see a future together. Typically loss of attraction in LT relationships is due to resentment built up over time. I read once for every negative interaction it takes 7 positive interactions to off set it or the resentment builds.

The point is that you are never going to know the true story and quite frankly the answer will never be acceptable to you anyway.

One hour at a time my friend.