I have been working as an engineer for about 8 years now professionally. My first job out of college lasted about 6 years and my second ran about 2 and a half. I've left both on good terms. The job that I just took was with someone I thought I knew to be good to work with (he founded his own company) and wanted me to join him as his right hand man. However, it's become clear in the two months I've been here this isn't going to work out; he seems to expect things that I can't do this early on and seems very upset with me. Except for this one mistake I have a good track record, though I do feel like going back to my last job is going to be strange and uncomfortable (people will ask: why are you back?)
My question is, when I talk to head hunters and new companies, should I even mention this position? I made the mistake of updating my LinkedIn with this already, so most people already in my network have seen. Is honesty the best policy here or should I go back and pull down my profile? If I should tell them, how do you phrase it to them in a way that says that I took a career risk that didn't work out?