He didn't bother to bring gothicpear over with him, to introduce her as his girlfriend to this FB woman-friend. That is the giveaway, I'm afraid, that his intentions bringing gothicpear with him, was just a ruse. Of course he used this FB event to secretly meet his FB-woman friend. It's not a case of lack of manners. He did it because he doesn't respect her. An ex-bf of mine did the exact same thing to me TWICE. There's literally no justifiable excuse gothicpear's boyfriend could (or will) give her, to explain why he acted this way. A normal boyfriend would have just spent the time with gothicpear and if he saw this woman, brought gothicpear with him. But he didn't do that. Because he's a cad.