Sorry about the crushing blow you experienced. You are completely correct - expectations. Keep them at zero. It is hard to do, I know.
Roommates raising kids, that’s how she sees things - for now. Give her space and time to see things differently.
You need to get to a similar place, detachment - more roommate for now as well. You won’t be as nervous regarding the near future or far future either - so you’ll know once you find indifference and detachment.
Hoping you have a Happy Father’s Day.
DnJ
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.