Help me write a paragraph telling my boyfriend’s mother that “ thank you for everything that you’ve done that may family couldn’t done it for me” It mustn’t be a formal one but a painful one

I just wanted to take a moment to tell you how grateful I am for everything you've done for me. There are so many things that my family couldn't do for me, and you stepped in without hesitation. Your love, support, and kindness have made a world of difference in my life, and I want you to know how much I appreciate it. Thank you for being there for me in ways that my own family couldn't. You mean the world to me, and I will always be grateful for everything you've done.