Well, I think this is normal for your boyfriend. Can't two people have friends of the opposite sex even if they are lovers? Moreover, he can tell you frankly that he simply thinks that he just wants to meet ordinary friends. Your anger at his confession will only make him afraid to tell you these things in the future. I think you should be happy. Your boyfriend didn't keep it from you. On the one hand, it shows that he has no other thoughts about that person, on the other hand, it shows that he trusts you. He thinks you trust him and won't be angry about it. If you are angry because of this, it will be counterproductive. One day he hid, either because there was a ghost in his heart or because he was afraid that you would be angry. In that case, it will be bad for all of you. So we should accept this kind of thing peacefully. Because there's nothing to be angry about.