Let me start by saying that I wouldn't wish what happened to you on anyone (particularly on myself

). Obviously, your life was going to be turned upside down if you didn't find some common ground with your wife after she discovered your hobbying, given her attitude towards it. Most people, especially if they have kids, aren't prepared to let that cataclysm happen. I also hope that you've made the best decision for yourself and that you will be happy with your choice.
Having said all of that, you've made several statements in your swansong post that suggest some further reflection is in order.
Tower said:
I’m definitely no saint, but I have tried to be “good”.
That's admirable, but you should examine where your definition of "good" comes from - an internal code?, religious tenets?, your perception of societal expectations? If your definition of good does not come from within, how has the definition you've been using served you in your life?
Tower said:
She lay down the law and told me under no certain terms was I to have sex with her
Whoa! Doesn't she understand: 1) the relationship between that behaviour and your hobbying, and 2) the message that sends about the "balance of power" in your relationship on a go-forward basis. In my view, her position on this is obviously counterproductive to restoring your sexual relationship with her.
Tower said:
Over the years, I have told my wife that I loved her, but in many cases how can a man truly love his wife, yet still hobby on the side?
Again, depends on your definition of love. Does a man whose wife is in a coma "not love his wife" if he seeks the comfort of an SP? I don't believe so. Love is a word thrown around by some as if it only means one thing. I think that we love everyone (who is close to us) differently. I even think that you can love and support your wife without having any sexual relationship with her!
Tower said:
I have known all along that my hobbying is wrong....We have just returned from a Christian (Catholic) retreat weekend with the intention of saving our marriage.
Man, that Catholic religion is strong stuff! Nothing has ever proved more effective in instilling guilt into people. I'm not sure how effective it is as medicine, however!
Tower said:
A marriage of true love is something worth fighting for! It’s like the country song ‘Love isn’t something that we’re in, it’s Something that We Do’. It takes a lot of work
I read and hear this kind of statement a lot. The idea that love is "hard work" or something "you fight for" seems like "square peg into round hole" logic to me. If you really love someone, I don't think it should seem like work at all. People are capable of almost anything. With enough determination you can "act" like you love someone, or even convince yourself that you really do love them. I think people who are "working hard" at loving someone are in denial about the nature of their relationship.
Tower said:
the particular SP was performing in ways I wished my wife would behave in her affection toward me.
Bingo. Has she reflected on her role in your choice to hobby? Is she prepared to change, or is she perfect, because according to Catholic rules she's done nothing wrong (by withholding affection from you)? When a relationship deteriorates, it's never fully the "fault" of just one person.
Tower said:
My wife had ALWAYS been faithful to me. I know I am married to an angel.
Again, only if "faithful" is narrowly defined by whether she's had sex with other men. There are many ways to be "unfaithful" and unsupportive without having extramarital sex.
Tower said:
My point is that I’m tired of living a lie.
Until your wife addresses her role in your choice to hobby, you still are.
Tower said:
I have a lot to do to gain the full trust of my wife, but it is worth the effort.
See my comments above about "having to work at it". Ah, Catholicism! - work hard, deny yourself earthly pleasures, give 10% of your money to church, listen to other people preach to you as if they are closer to God than you are, and maybe you'll be granted happiness in an afterlife! You wouldn't buy this if it was Amway knocking on your door, would you?
Tower said:
I know I am blessed to be married to such a strong and wonderful woman.
See my comments about her willingness to examine her own actions.
Tower said:
It’s time I took responsibility for my life and become the husband, father and friend that I should have been years ago.
Ok, but I assume these aren't new objectives for you. Why did you think that hobbying wasn't inconsistent with these objectives in the first place? Maybe the answer is that one doesn't have anything to do with the other.
Tower said:
Nothing wrong with that. However, my best friend and I don't have sex, and he wouldn't expect me to have sex with him nor does he care who I have sex with! Is it necessary for you to have a sexual relationship with your wife for you and she to be best friends. If so, why?
I'm completely supportive of you finding greater piece of mind regarding the way you live. I just don't think you solve a problem by pretending it never existed.