I was offered to collaborate as freelancer in the company I used to work (I quitted and I'm working in a different place right now). I was talking with the company owner, who told me that in case I decided to accept the conditions, I'd be put in a different project from before... To make a long story short, now they have notified me that the project is not different.
The thing is that I had already accepted verbally (when I spoke with the owner) and said that I have plenty time to spend in any project, but actually I don't want to be in the same project that was the main cause by which I quitted.
Now I want to refuse their offer, but I am afraid that it could affect future relations between us if I don't do it properly.
How can I nicely tell them that I don't want to have anything to do with that project but that I'd be will to work in any other.