Things are not always what they seem?

A friend of 20 years ,who always enjoyed the finer things in life, was a strong individual and had lots of friends and family and good social life, was suddenly faced with her OH being taken permanently ill. She found herself in the position of carer during her later elderly years and seemed to change over night. She would make all sorts of arrangements to go out but cancel at the last minute and also seemed to turn quite aggressive in quite simple conversations about say the fact that my grandchild would not greens etc. She became very hard to spend time with and I felt wrung out at each meeting. However, being me, I let it go and would send messages and texts asking how she and her family were keeping. She did not reply for months. Recently, she contacted me to go out on a certain day and unfortunately I was unable to oblige as I had a previous arrangement. I received a message back saying that our friendship had run its course, she unfriended me on FB and that was that. However, as I had been through some pretty tough family stuff myself, I seemed to understand where she was coming from. I saw her as overwhelmed adjusting to her new situation, her life had changed and she was responsible for OH's welfare. My decision was to leave the door open and, if she wants to contact me, then that's fine. I just tried to put myself in her shoes and remember becoming quite defensive when in a not too dissimilar situation. Who knows what goes on in some people's lives?