My suggestion is for you to give the friendship some space and seek other hobbies and friendships. Maybe with a variety of new friends you will feel your own needs met... you can socialize and plan fun events while still maintaining this friendship... People’s interests and needs do change over time. I agree that friendships are important and I don’t think it’s fair for one person to always be available at the convenience of another. I don’t know if I would have a big discussion about it with your friend. I think I would just give it a bit of space first and focus on my own needs.