My friends don't keep track of invites. We've always sort of operated on whoever's doing the best financially. A couple of them in the tech field make 3x the income I do, so paying an extra $15 at dinner is nothing to them. When I was dating my now spouse we started alternating who paid for dinner. We both made about the same at the time, so this kept either one of us from being financially overburdened.
I was a caretaker to my mother for 3 years. She was legally blind and had arthritis, so I basically had to do everything for her. We went from being best friends to my highly resenting her. When she finally passed I didn't even grieve, I was so emotionally drained from the years leading up to it I felt dead inside. This feeling lasted years after she was gone before I finally started to miss her and regretted not having the opportunity to repair our relationship.
I'm sure it's different for everyone, but that situation was absolutely toxic for both of us and if it happened again today I suspect the result would be the same.