Most Helpful Guy
You love him like nothing else. But you cheat on him. You say you want to save him from being hurt, but you really want to keep him from throwing you out on your ass. You don't plan to fuck his best friend or anyone else ever again. You just wanted some sexy taboo fun because he hasn't been offering you enough of that (according your your scale of what is enough), so the next time you feel like some sexy taboo fun you will just do it again. Do him a favor and get the fuck out of his life!
Most Helpful Girl
Oh wow. If your boyfriend is neglectful, the right thing to do is either discuss it with him, or dump him. You don't go behind his back and cheat on him with his best friend.
You should tell him. He deserves to know.
Stop mocking/disrespecting the poor guy.
Anyway, you're delusional if you think that you love him.