I second this. I had a friend asking me to join his business and I said: "I'm sorry but I don't feel comfortable working (seriously) with friends because I don'

I second this. I had a friend asking me to join his business and I said: "I'm sorry but I don't feel comfortable working (seriously) with friends because I don't want to ruin the relationship and also I don't want to feel bad if I want to leave". Plus you wouldn't feel comfortable asking for raises etc.