Is there the equivalent of “pre-martial counseling” for a potential cofounder?

I've watched what I could find on YC's take on this - I have a potential cofounder who :

- Has deep domain experience - Balances the startup's roles: He sales/marketing/networking vs me as technical/designer - Both share same profession & passion to solving this problem.

I'm fine with giving equal or near-equal equity (though I'm still looking at the 1 year cliff/4 year vesting concepts).

Mainly, what I have is a fear of commitment. I've been working on this solo for so long and that has been a mistake of mine. However, I can't make one mistake push me into making another and choose a bad co-founder.

Are there any other resources you recommend me check out? Risk redundancy and share with me something that might have slipped through the cracks.