Just being silly or trying to be cute?

So there is this guy at my school. I wouldn’t necessarily say we’re close. However, me and him are chemistry partners. We joke around a lot, teasing each other sometimes. However recently, he has been trying to be unusually silly, or cute and I can’t figure it out. For starters, instead of me and him jokingly argue around about every little, he’s been a lot more obedient, and generally being a sweet person. I don’t want to mistake this for kindness, but i’m not sure. Second, he’s been acting a lot more vulnerable. He’s letting me help him instead of telling me to piss off. An example in which I can’t tell if he is being cute or silly: Me and him were working on trying to find something out about a substance. I was using our tools, and he came over and asked if he could use them. In a obviously joking way, I said “Piss off I’m busy,” he then proceeded to lean over me and give me a really pouty lip, instead of fighting back. I felt bad, even though I knew he was kidding, so I just gave him the tools and laughed it off. I can’t tell if this act is him just being silly and joking like me and him usually are, or if he’s trying to be more submissive and cute?

Just being silly or trying to be cute?
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