I know how u must be feeling. Try to continue supporting your friend the same way because good and bad times come on everyone and someday (God Forbid) you might need your friend same way.
My best friend’s suffered loss of a loved one 4 years back which was a major blwo to her I was there for her she doesn’t have a sister and she used to share with me same details over and over again because it’s used to give her peace. Now I am going thru a rough patch and this friend of mine makes sure to take time out for me from her v.busy schedule and take me out evey weekend and even during the week. What goes around comes around 