“The most that I can do for my friend is simply be his friend.” – Henry David Thoreau
You have no obligations to do x, y, or z to be considered a good friend. And your friend, if they are truly your friend, should not place unrealistic expectations on you, make you fulfill certain requirements, or check certain boxes to be considered a friend. Work on being supportive, on checking in with them on occasion, and on being happy for them if they are happy or helping them when they need help. It’s that simple.