Any books for healing attachment style?

I’m anxiously attached and DESPERATLEY need to fix it. It comes out in all of my relationships and never in a good way. All I want is to be securely attached, to be able to be certain of myself and my feelings in a relationship and not be so dependent on someone.

I’m in therapy but feel like it’s not really helping. I think I need to read up on it and understand what it’s like to shift your attachment style from anxious to secure.

Any suggestions would be helpful, thank you!