What does it mean when a guy tells you to behave?

My boyfriends been acting distant recently so we don't talk much anymore. I'm starting to think he's not interested in me anymore.
Today he messaged me and we talked for a few minutes. Even though I was at a comedy show with my cousin, I told him I wasn't that busy (mainly because I missed & wanted to talk to him). But I guess he didn't want to disturb me or talk for long so he said "I will let you go and behave."
What does it mean when a guy tells you to behave?
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