Thank you very much for your reply.
As of right now, I'm not sure if he knows that I talk to him every day. I am pretty sure that he still knows that I'm friends with him, though.
I guess I'm just afraid that if I bring this up, they'll think I'm trying to take the easy way out, or just want "two boyfriends because I can" neither of which are true. That, and I don't want to cause anyone any pain, and I can't imagine this not doing some of that. So I'm scared he'll think that if I love another person, then I can't possibly love him.
What would be the best way to bring up the subject of Polyamory with them?