Do you really need him? If not, ditch the guy: it's already hard enough making good decisions with the two of you. It sounds like there's quite a lot of negativ

Do you really need him? If not, ditch the guy: it's already hard enough making good decisions with the two of you. It sounds like there's quite a lot of negative energy going on: I would focus that energy on building your product, not on dealing with partners who are only in it as a no-risk sideproject.