I can almost guarantee that your b/f will want the truth from you. Tell him. Why keep it from him? To not hurt him? You have already done that. It's just that he doesn't know you have. And THAT is what's deceitful. Honesty is never the wrong thing to do. And I don't know why anyone would recommend that. This is your b/f's friend. Of course he will find out. If not from either of you two, from someone else whom you least expect. And I can guarantee that one of the first things he will say is, "Why didn't you tell me?" Speaking from personal experience, the LIE will hurt worse than the truth because it's coming from someone he trusts.
