Should I care if my friend never calls or hangs out with me?

if you actually consider them a friend and been through stuff together and you did a lot to them, then this doesn’t feel like a real friendship I’m sorry 😅
Friends “make” time for each other.
I’d be upset and sad tbh. Maybe you should tell them and explain your feelings to them and see their reaction first
You never know , maybe they had some personal reasons

No, they're probably just hanging out with other people.