I'm going to intentionally ditch my friend
Did this friend do something to deserve being abandoned?
I'm tired of his boring stories!
If your friend is repeating stories or just describing things you're uninterested in, let them know. It's cruel to just ghost someone and keep them guessing as to why.
Why? I'm going to ditch him, he's boring.
I assume you wouldn't want someone to ditch you without giving a reason, right? Do unto others as you'd want done to you.