hi SBE,
no contact is one tool out of several approaches to detaching, each with advantages and disadvantages.
one of my favorite articles here is this one:
https://bpdfamily.com/content/no-contact-right-way-wrong-wayit addresses so many of the emotional and practical pitfalls, and how and when no contact makes sense. lots of perspective and valuable information. does it help, and do you have any questions about it?
i think in your case, it might be best to state that for x amount of time (you dont necessarily have to be specific), you need some time and space to yourself to focus on you. suddenly cutting him off can provoke anxiety in both of you, he may up the ante, and you may or may not have the resolve right now to stick by it - you sound worn out, and this is tough stuff. having said that, he may still not respect your wishes, and he may still up the ante, but probably not as much as he would if you cut him off with no explanation.
once you state that you need that time and space, mean it, do it, and use it. doing otherwise communicates to him that all he has to do is up the ante and you will crack.
after that point, you can make more long term decisions about contact or not.