I'm sorry you're hurting. And sorry about the test.

I think you should go tomorrow and talk to him about these feelings.

You could just walk away, but that will produce zero change in you. Presumably you want to be in therapy to change yourself, yes? The way people change themselves through therapy is by showing up and talking through difficult emotions. All of them.

I think your therapist's message sounds very caring, actually. I don't doubt that he cares for you, based on what you've said before. You guys made it through your past rupture. I think you could make it through this one. That's how the process works. Although I know it is painful.