Hi Matt,
You seem to be an open person so I'll take the liberty to be totally open with you. I read carefully your notes. It seems that your relation deteriorated steadily untill you reached a very low point. You are more like 2 people living in the same appartmet (well with your son). You (both) had to attend to it long ago (marriage counseling). Sinch you didn't do it she might do the mistake and find attention (and even love) from someone else (sorry !). If you still love her better try hard, very hard, the best you can, to bring your relations ( + love) back to track. Don't give up, and don't blame only her...... you have a big share too.
Best regards,