My boyfriend thinks he didn’t cheat. Is he right?

My boyfriend cheated on me with an old high school mate. He went to school with a girl for one year but admitted a long time ago when I found out he was cheating, they never actually talked during high school. They added each other on social media months ago while we were together and he initiated everything and fell for her. He thinks that since he “met” the girl before me that he didn’t cheat.

My boyfriend thinks he didn’t cheat. Is he right?
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