Do you act serious or immature around you crush?

Sometimes when me and my crush are hanging out with his friends, he will steal their stuff, or kick them in the butt, and do a lot of silly things. Then, he looks for my reaction. But then other times he acts really serious when his friends are around, and when he talks to me, he seems very mature and serious why is that? Is it because he isn't interested in me or something?
Serious (mature)
Immature
Both
Other (explain)
Select gender and age to cast your vote:
Do you act serious or immature around you crush?
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