Re: Friend ignoring me, what would you do in this situation?
Well I must say that the advices you have already received, in my point of view, are the same thing I would say...and plus the fact that I experienced the same situation as you did with someone earlier this year several months ago.
She had her foot down on the subject, gave me no ability to defend or redeem myself; I was given no fair justice in the matter.
There isn't anything you can really do about it if you have done everything you can to "redeem" yourself on your side of things. If you have or feel that you have done all that you could, and yet your friend still doesn't change paths, you might be hopeless. At least I am.
In my definition, I wouldn't consider that a friend -- but I can't really make this judgment since you say "This is someone that I care about and respect greatly, though he may not believe me about that anymore, and I've got no plans on writing him off any time soon," which is pretty much the same thing I can say in regards to my experience.
Generally I would just tell someone that this isn't true friendship, because if it were true, they would express justice in the friendship -- otherwise that would be like dictatorship/taking advantage of the other/being prejudice/unfair/illogical/whatever.
I hope you get a better response than I could come up with.