Solost No, I don't believe he met his soul mate or the love of his life. I think he was such a pompous prig for years that when he developed a perfectly normal crush in mid-life, he couldn't recognise it as that and instead convinced himself that this "must be love".
Instead of recognising his own human frailty and telling himself that "this too will pass" or better still, taking a relational risk and coming to you to tell you about these strange new feelings, he convinced himself that this love was "bigger than both of them" and that the honest, moral thing to do was to come clean and leave, to be with that "love".
Others' opinions of him are terribly important. I've always suspected that and this is further confirmed by that pathetic E mail to his friend. It would be great if the friend knew him well and challenged him about his actions, but I expect he will offer platitudes, such as there must have been weaknesses in your marriage, or that the OW must be special and we only get one life and all the other dreary cliches people spout, when they really should know better. 
I firmly believe this was just a crush that got out of hand, that's all.
However, it is precisely because he is so self-absorbed and pompous that it will take him a long time to recognise all this - far too long for you, Solost.
I genuinely think you need to spend some time going back over the affair, for some lightbulbs to come on. I understand why you haven't done that yet; you have been in crisis mode ever since. You have always thought that he would "come to his senses" and that the re-construction of the affair and your lives leading up to it, could come later.
However, as you may have seen me say on other threads, even if a couple parts, it is terribly important that the one left behind understands what happened to them. That process gives you not just your past back, but also your present and future. Understanding the personality and character traits of the person who has had the affair is essential, because it liberates you from thinking that you could have prevented this happening, either then or in future relationships.
One of the ways I think this process can help you is to let you see your H, the way we do. To see that the lies, deceit and manipulation that were present in the affair, didn't stop when he left.
Counselling would be great, I think.