Her therapist also seems to support her belief that I was emotionally abusive (controlling) and I assume is supportive in her decision to leave.
MrSunny,
It's a common theme around here; the therapist always supports the spouse that they're seeing in therapy. That's because spouses often "spin" the truth (just like a politician) when talking to the therapist or the spouse is just bullsh*tting you about what the therapist thinks or it's a crappy therapist. It could be all three.
To be honest, most likely your wife met someone that she really really likes. I know that in your case it couldn't possibly be true, but hey...