What does it mean when a guy is concerned about who you are texting?

My "friend" has been acting very weird lately. Ever since we started working together on this end of the year project he has been trying harder to get my attention and has been more social. Today, I was texting someone in class, from gag actually lol, and it became obvious. Later he asked who I was texting and attempted to grab my phone, in a playful way, I think. We are not in a relationship and he is not my boyfriend. So why did he question who I was texting?
What does it mean when a guy is concerned about who you are texting?
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