The guy I like is teasing me?

My crush is also my friends crush so I'm trying to back off but randomly he started teasing me a lot. He teases other people, but today i was doing work, and he kept pretending to propose. Then he was being odd so i was laughing and jokingly said go away, and he was saying you know you love me. Why do sudden? And what do i do to make sure i don't fall for him harder?
The guy I like is teasing me?
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