Is this guy jealous or just being nosy I’m so confused?

He saw me talk to guy I really thought he wouldn’t care or notice but that same day he catches up to me bc I was walking and the first thing he asks me is “who was that guy I was talking to “ I said I don't know but he sure is cute” , the next day he mentioned him again he found out his name bc that guy was posted on a paper and he saw him and saw his name so he started saying his name, he comes up to me after break and says hey Albert said hi to you, than the same day he kept mentioning his name I don’t know why, I told him his German he was like is he really German or just saying that! Stuff like that like what’s his problem

Is this guy jealous or just being nosy I’m so confused?
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