I think he likes me but he has a girlfriend!

he started talking to me first and kept being really nice and asked me a lot of questions about myself. he even stares at me a lot and his friends will stare and smile at me. he offered to take my paper and strikes up conversations and everything. he even flirts with me. so I brought up his girlfriend. he said they'd been dating for 5 months and was acting like his girl friend annoyed him. I said they made a cute couple and said it was cute that they were dating and he sarcastically said "yeah..its SO awesome" and rolled his eyes. he kept saying that she had his balls in grip after 3 days of dating her. I'm not sure if he's happy with her but I think he likes me. help me. give me advice.
I think he likes me but he has a girlfriend!
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