@Sandi: I thought I could deal and finances being what they are right now, held me back as well. That and a pile of self-pity too.
@Mozza: I've asked myself the same questions many times so far. I think she would say what I mentioned above: pushing too hard in arguments and trying to 'win', the estrangement of my daughter and I, lack of income for a while and maybe not doing some of the household stuff she wanted me to do. And maybe how clingy I became, as I mentioned above. Maybe, due to my health problems, she felt like she had to take care of me even though I never asked her to...I know that can be stressful on a spouse. There may have been more, but she never told me.
I own up to my own faults and damage I've done to our marriage. I'd give a great deal to make up for them, that's for sure.
@Hoju: I've already begun doing that in the last few days. It's really hard as I am a 'talker' and just want to reach out to her; although her voice pains me to no end right now it still comforts me at the same time.
Thank for the replies so far, folks. It is sincerely nice to know someone is out there.