No contact after a break up with myself and my daughter

I have recently gone through a break-up after a long term relationship. My ex has chosen no contact which I am respecting as well as his decision to end the relationship. At the same time I am sad and disappointed he has not been in touch with my daughter who is 13 and who he lived with during this relationship. My daughter says she is fine about it, but I worry she will feel abandoned, as her own father did the same thing, and she has seen all the men in my life walk out without making any effort. I am finding it hard to understand his decision to not send her a message or get in touch with her, seeing as she has nothing to do with our break up.