[michaelochurch]

I have been there. There are three options here:

Option A: get the fuck out.

Option B: get the fuck out.

Option C: get the fuck out.

Your boss is a jerk and doesn't pay on time. He's hiding high-level information, which means that (a) he's planning to screw you, (b) that the investor front is going badly and there might be nothing happening, or (c) that he doesn't view you as an equal partner in the business. (No exclusive "or"; probably all three are true.)

You're spending too much time and emotional energy on a business that has no future. If it had a future, it wouldn't have existed for several years and still be missing payroll. If you're honest with yourself, I think you'll probably notice that what's keeping you there is the "sunk cost" fallacy. Stop wasting more time. Count it as a learning experience and use it for personal growth, but get out as soon as possible. (Start sending out CVs. Don't actually quit until you have a better job.)