The guy I like teases me about liking him, has no idea and acts like he likes me, but has a girlfriend. Why?

Anonymous
The guy I like teases me about being 'in love' with him. According to his twin brother, he has no clue I do and is just messing around. He always flirts with me, and holds me close to him by my waist and teases me by saying things like "You're so in love with me. Every time I'm with you, you can't stop smiling and you blush." He acts like he likes me, and tries to tickle me as well knowing I hate it. But he has a girlfriend. Why does he do this if he has a girlfriend? He's been doing this for over a year, and is genuinely a nice guy not a player. Help me out?
The guy I like teases me about liking him, has no idea and acts like he likes me, but has a girlfriend. Why?
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