Define the behavior you need to pause
Say whether you need fewer messages, no visits, time away from a group, or a break from discussing one topic. Use your needs rather than diagnosing the friend's personality.
Set a review point when possible
Offer a date or condition for checking in if the space is temporary. If you do not know the duration, say that honestly and do not promise contact you may not want.
Make your actions consistent
Do not request distance and then seek constant reassurance, favors, or social media attention. If the real decision is to end the friendship, use clearer language.