Four separate relationships for one person seems like maybe a little too much to me. Even if he can juggle it, you wouldn't get much of his time/energy. Do you think you would be cool with that or do you think you'd end up feeling like this: http://www.polyamory.com/forum/showthread.php?t=19512
The major players. Me, 30ish bi female. Gia, girlfriend of 4+ years. Clay, boyfriend/dom. Davis, ex/friend/"it's complicated." Eddie, roommate & fwb.
The supporting cast. Eric, Gia's husband. Bee, Gia and Eric's toddler. Dexter, Gia's lover. Helen, Eric's lover. Izzy and Nikki, Clay's partners. Liam, Eddie's husband.