"I instead (finally) simply told her that I wanted to spend time with her but if she was going to fill her life with work and friends and not include me, I would not pursue her. Her response, in her words: "Well thanks for letting me know.""
Being passive and checking out of your M seems to be your MO for quite some time now, years.
You have good rationalizations for it. I believe that you have done a lot for yourself, you seem to be doing great. BUT, doing more of the same this summer simply is sitting around watching your M wither and die.
To me, between the lines, you sound like you are still trying to *win*, being stubborn that she make the first move to prove you are right.
Look, I BELIEVE you when you say your M is unlikely to be saved. I even AGREE with you. That is TOTALLY not the point.