Ha! What does love you long time mean?

okay so me and my boyfriend were walking down the hallway when he says "love you long time."

I didn't say anything because I thought he was joking. then later on I said goodbye and he said "love you."

I didn't say anything and left, we were only going out for about a week. then after that he said, "well it's not like I said anything" and walked away...What should I say next time I see him?
Ha! What does love you long time mean?
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