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Why would you say you know what this girl is up to especially after sharing when she saw you, she wondered why his EX-girlfriend showed up so it sounds like she thought your guy was single. What the hell did she do wrong? Other than liking your shit for a boyfriend?
As for were you right, of course you were right. If a partner hides what they are doing and lies about it especially about the opposite sex, then chances are they are doing wrong. Unless of course, I am a crazy person and question everything they do and say and freak out over everything they do and say. In that case, I still do not think they should lie but I would understand it if they did.
But not about this stuff. He lied that he had a girlfriend to another girl and he lied to you that this girl he was seeing was in a relationship when she wasn't. Not good...