Guys, do you playfully tease or be rude to girls you like after being overly nice in the beginning?

This guy was very sweet to me in the getting to know stage and now he knows that I like him he constantly says rude sarcastic things or playfully teases. He never compliments me now. Has he lost interest and taking advantage of me liking him? Why is this and what do I do?
Guys, do you playfully tease or be rude to girls you like after being overly nice in the beginning?
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