Agree. It's going to hurt a lot to cut him out now, but he will most likely not get better. As to how to go about it: it's like breaking up. Have a short conv

Agree. It's going to hurt a lot to cut him out now, but he will most likely not get better. As to how to go about it: it's like breaking up. Have a short conversation and be very, very, very clear ("I do not want to continue this business with you"), don't go into the reasons to much (don't say "you suck", say "it's not working out"), and then shut up. Include a buy-out offer ("For X$, I can buy you out, or else we'll have to shut shop."). Then let it sink in, set a time to meet the next day. The other alternative is to talk to him about your concerns and see if you can work it out. Perhaps more mature, but somehow I don't feel this is going to work out, since you are questioning the quality of what he does, which is almost impossible to change (versus something specific that he does wrong, which would be changeable.)