Ouch!
That's a pretty big bombshell to drop at the end of session.
I haven't had this experience, but I've heard other people say that their T getting married or having a baby has brought up tons of feelings - jealousy, fear, abandonment. So I would say whatever you are feeling is normal, and probably expected.
I hope you're able to talk about how you're feeling in the sessions before his break! And then, you can talk to us during the break itself