Jung,
I'm so proud of you for the great work you did today! This is an amazing first step, and your determination to go against your tende! Though I can hear you're struggling you seemlike a very strong person with a lot of insight into things. It's great you're reaching out too!
It is a major loss in your life. Your therapy relationship was a relationship, very intimate, like a friend or significant other or something, though of course not exactly like that! But very important emotionally. So think of it like greeving the loss of someone like that, give it all the time you'd give any other important relationship.
In this case, you're right, it is a lot like leaving a cult, or the first thought I had was like leaving an abusive partner. His response of "I'm sorry I hurt you. I really care about you," I expected. It's like the abusive partner saying they'll never hit/insult/ do whatever to their partner again just to get them back. Please try not to fall for it!
I know it's hard too missing the daughters. This whole situation is so complicated, but you're facing it with great courage. Keep posting here and reaching out for support.