"My door is always open for you. You are the mother of my child."
I think that's enough to let her know she can turn to you without any backlash. She's expecting a lot of crap thrown at her if she comes back to you. She isnt looking forward to the doghouse. You need to let her know that there is no doghouse waiting for her.
I think what i wrote there is pretty good. If you can write song lyrics you should be able to edit that draft to something better too if you have the time. Otherwise I think its acceptable as is...there's always room for improvement, there just isn't always time for it.
If she does hit you with "Are you expecting me to get back together with you" you can hit her with this maybe :
"I am not expecting anything. I am taking everything a day at a time. My door is never shut to you, we have been through way too much together for me to hold grudges or be angry. Right now the place I am at, hostility and conflict are the furthest thing from my mind. I just want everything as happy as possible for us."
