Do guys only tease girls they're in love with?

My guy friend teases me a lot. Sometimes he even lifts me off my feet or tickles me for no reason. He also jokes about me dating other guys. Some people think we're in a relationship. When they make comments about us, he acts like he didn't hear it. He does have a girlfriend at this moment. Is it normal for a guy to tease/ touch female friends when he is in a relationship? And why does he ignore comments from other people about us?
Do guys only tease girls they're in love with?
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