100% this. If you guys had significant traction with your startup then it might be worth it to work really hard to try to salvage the relationship.

But right now you're just wasting your life. The most valuable resource you burn through at a startup is your life. Startups are stressful, they wear you down, they're not great for your finances, and many of those are doubly so if you don't get along with your cofounder.

Just quit, you don't owe anyone your life. You are less likely to find traction with two cofounders with a bad working relationship, and if you do find traction you are less likely to be able capitalize on it.