The advice that we provide is just that advice and you need to take from the advice what you can use and the rest...toss out. It sounds like the therapist realized that things weren't going well in the last session and I'm glad he apologized. Your h sounds like he's projecting his thoughts/feelings on to you. I would take what he says w/a grain of salt because they do a whole lot of projecting during the crisis. No, don't reply to that portion of the email. You absolutely do not need to justify yourself anymore.
Travel safely and try to enjoy your time away. Hopefully he will enjoy his time at home w/the children.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.