Thanks for all the great replies. Very obvious everyone has different experiences with all 3 living together and opinions to why or why not.
We have known him for about 8 years. He and my wife have been in a relationship for about 4 years, and be it long distance, visits ranged for 2 weeks to a month with each visit.
We are taking it slow, all talking about the possibility of living together, the up-sides, the down-sides, and everything that comes along with multiple people in multiple relationships.
Red Pepper, we've been reading your's and Mono thread on here, which I think is primarily written by Mono, along with yours and others input, and was somewhat surprised by your response, not in a bad way, just in a way that I would not have expected. It sound like your situation has turned out great, but I am sure without there own trials and tribulations, but do have to say reading it has been inspiring, see how things have gone over the past several years.