Just this week mine ripped my heart out and stomped on it with the teen attitude and "I hate you" crap. Fine, here's a little tough love since you're so big that you don't need anything from us anymore - get your own car insurance, pay for your own college, pay your own rent and everything else. My heart couldn't take any more of the bs and now it's having to deal with something similar to a divorce. I don't know where, how, or what we did that was so bad but, as you say, whatever.
Boy can I relate to your story. I have had my heart broken so many times over my kid. I would NEVER have spoken to my parents like mine did and sometimes continue to do to me. I know now I have “helped” to much and she hates me for it. I continue to feel guilty that I must have been a pretty rotten parent for her to turn out the way she did.
If you have examined your conscience and have nothing to apologize for, then there is nothing to do but wait and pray. There is no point going begging if they are in the wrong.