I'm thinking of ghosting a friend of 25 years
Why would you ghost a long time friend?
I'm bored of taking care of them as a friend.
25 years is a long time. You shouldn't ghost someone who has been there for you for that long. They deserve to know why.
I'm entitled. I can make a friend ghost whenever I want.
You are not entitled to that. You need to tell you friend that you cannot care for them, they are not going to just accept you ghosting them.