I really don't know how to respond breh. What would you say if you were me?
Honestly I’d just say
Hope you are able to get the help you need seems you are going through a lot. Wishing you better days ahead take care.
No need to mention what happened the relationship, what you did wrong or what she did etc
I’m not relieving anyone’s guilt or letting them know I’m waiting for them etc writing a long paragraph back
Short and concise
She knows your number if she ever wants to reach out again
That’s just me