How to lighten up a conversation when it gets too serious?

A boy at school who likes me often tries to see if I like him back by playing my words, often leading to an awkward conversation (i. e. last week I jokingly said that I didn't care about people that day and he started asking if I cared about him for 5+ minutes). what are some good things to say to change the subject and avoid the akwardness? I'm not interested in him.
How to lighten up a conversation when it gets too serious?
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