I understand the reasons for choosing a friend as a co-founder but I think this situation is a bit different. I have spoken with him about my concerns and he a

I understand the reasons for choosing a friend as a co-founder but I think this situation is a bit different. I have spoken with him about my concerns and he assured me things will be fine however his actions don't seem to match his words. It's a delicate situation because I don't want to lose a friend by being too "honest" with him if I decide not to take part as he will surely want to know my reasons.