Please try to remember when these blow-ups happen (because they will now that things are going to beome more intense in therapy) that it is going to get rougher right now before it gets better...remind yourself of that. He's going to resist that ST pushing to get at the real issues, he's going to resist, defelect, delay and camoflage as best as he can...but this ST isn't going to let him.
You two made it through this one, just KEEP TALKING.