Considering your state of mind, it’s not such a good idea to decide on anything long term right now.
You need to accept that people change. Some for the better, some for the worse. You just need to decide if they’re worth keeping in your life.
Something seems amiss, but you can’t quite pinpoint what it is. Maybe you missed doing one of the things you’re supposed to do.
When you can’t remember what you did to upset somebody, it’s always best to retrace your steps from the last time things were still ok.