What does it mean when a guy downplays a relationship with another girl for his friends in front of you?

Anonymous
My crush was talking to his friends about their love lives today in class. One of his friends asked him if he was dating some girl and he said no it's just a thing while I was sitting next to him after we were talking all period long. He's been flirting with me for the past week and a half in class, then all of a sudden on Monday, for the first time his friends bring up his love life with me around. Are they doing this to make me jealous? He's been staring at me, smiling at me, trying to make me laugh and stuff the whole time we've been talking.
What does it mean when a guy downplays a relationship with another girl for his friends in front of you?
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