I want advice on how to explain to my boyfriend that this habit is really hurting my time with him. How can I help him understand its not a good habit and reduce doing it around me?

We've been together for nearly 3 years, living together for 2; when we are together he cracks his toes, feet, wrists, knuckles, and sometimes neck every 10-20 seconds. That isn't an exageration, it really is very constant and I'm struggling to cope. It's a habit he's had for a long time, but last year he began cracking his wrists the most. He does it while driving, reading, watching tv, gaming, talking, cuddling, anything. He twists his wrists in the air and cracks them all over. If it isnt that its another joint.

I've tried telling him to please practise resisting the urge, that it isnt necessary and I wouldnt mind if he did it, just not every minute, Ive suggested he goes to another room to do it to help break the habit but he just doesn't try and keeps doing it. It feels like he doesnt understand how serious it is to me. Sometimes I just want to relax with him and not hear his joints cracking, Ive resorted to wearing headphones too.

TLDR; Boyfriend cracks his joints multiple times every minute during most activities and I want to help him reduce it and understand why its irritating me.