Generally people when people leave a marriage they have help (a support system of some type encouraging it, i.e. friends or coworkers going through divorce, a MC who supports them in it, an affair, etc...). The therapist may be the support system. But you can't fully blame them. It sounds like this is where your wife was heading anyway, this is what she was seeking and maybe it's even where she needs to go
I can almost guarentee you there is nothing anyone here can say to change your wife's mind. I have friends going through this (they know me, trust me, think I'm rational) and I can't change what they are doing (even by example!!!). I'm convinced it's just something people need to work through. And if you try to change that you'll only be blamed in the long run for holding them back or trying to control their life. You have to let go. Hanging on only prolongs it because she's focusing on you and how you're trying to keep her from doing what she wants. So, I repeat, let go!
By the way, if your wife is taking alternative meds for depression they shouldn't be used in conjunction with SSRIs (particularly 5-htp). Unfortunately althernative meds would probably not be effective enough for severe depression.
There is no arriving, ever. It is all a continual becoming.
