Yeah I'd pretty much be upset and somewhat angry if I found out 7 months down the line. Likely that she got triggered mentally during your argument that resurfaced the memories and feelings she had 7 months ago when considering legal separation. That to me sounds like an act of desperation. Forgive me if I'm wrong but im thinking legal separation is separate from divorce in which case she was probably thinks ng about time out before making a permanent decision either way. We can be real difficult people to live with.

If need be find a new couples therapy and make sure you're seeing your own T too to deal with your own issues.