Every relationship rides a down escalator, so ending one just means stepping off; stop investing, decline politely, never ghost, and leave the door open.
The idea
Like any garden, a network needs pruning sometimes. Maybe the person made it clear, maybe a turning point in your life changed who you want around you, or maybe the energy just isn't there. Relationships are down escalators: without effort they drift apart on their own, so the easiest way to end one is to step off. The goal is to keep your boundaries while causing as little harm as possible.
How to do it
Trust your inner compass. If every conversation is a struggle, you don't need to diagnose why.
Stop putting time and attention into staying in touch. No more proactive outreach.
Don't ghost. If they reach out, reply.
If they try to catch up, politely say you have other priorities and can't talk right now.
Leave the door open. People change, and a friendship that goes out with the tide can come back.
Example
I once had a call with someone where, despite mutual connections and shared interests, the conversation felt like pulling teeth. I used to think that was my fault (not enough sleep?). Differing values, a power imbalance: does it matter? Not every connection is meant to be made, so save your energy for the ones that flow.
Script
Coming back someday: "Hey! Long time no talk - thought of you today!"
Mindshare Decay: After you meet someone, the odds they think of you slide toward zero unless periodic, valuable touchpoints push the line back up.
How Someone Treats Anyone: How someone treats anyone is how they'll eventually treat everyone; watch how they treat people who can't help them, and take notes.
The Energy Audit: Scroll last year's calendar, notice your gut reaction to each name, and sort people into energy givers, drainers and forgettables.