What is Reddit's opinion of How to Establish Boundaries: Protect Yourself, Become Assertive, Take Back Control, and Set Yourself Free (Be Confident and Fearless Book 3)?

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Sounds like he already has demonstrated a tendency to disregard your boundaries which usually isn't a great sign. And I would call that "disregarding your boundaries", not negotiating - in a negotiation both people generally get something out of it, what are you getting in this scenario except stress and pressure while he gets what he wants?

Maybe if he knew you were on the verge of cutting him off he'd understand how big a deal it is for you? I completely understand the concern about revealing too many personal issues, I don't think you necessarily need to do that. Maybe just say something like, "If you can't respect my need for space without trying to change my mind and pressure me then I can't continue in this relationship." Short and sweet, you don't have to justify yourself, you have a right to your own preferences.

You might find this book helpful: How to Establish Boundaries by Patrick King. I know, I know, it sounds like a cheesy generic self help book, but it actually is a lot more no nonsense and to the point than most books like that, and given that schizoids (and many people, really) generally don't tend to have healthy examples of boundary-setting to learn from, often learning from a book is a good starting point.

Anyways, whatever you end up doing, I hope it works out and that things get better for you!