It's okay. It will be okay.
You weren't "bad". You were triggered. The unexpected change in him texting caused a trigger (intense emotions related to the past) and those little ones were *scared*. It came from a very young and scared place, and you were did the best you could with that at the time. I hope you can have some compassion for you around this. You were just scared. And scared is completely different to "bad".
T also will know that you were scared rather than "bad'. Helping those scared parts will be something to work on sometime during the course of your therapy with him. You can talk about it when he returns, or much later in therapy, or not at all. That will be up to the two of you.
But right now, he just needs to focus solely on his recovery. He could have had surgery complications or anything. He could be in a lot of pain and find it hard to focus right now. So he has set that boundary about no texting until he comes back. That doesn't = you being "bad". It = him needing to set limits on what he can and can't do right now. And right now he can't manage texting. Physically, emotionally, mentally or whatever - he is sub-par and can't do it at the moment.
But he will be back when he is recovered and he will see you again then .
He will.