help? love and dating.

okay so basically idek if this guy likes me. he flirts w me but says he has a girlfriend but he barely has a picture of her like only one picture and barely talks about her and his friend says that he really does have a girlfriend. but all my friends think he's lying and that I should go ask him out. (but to me I don't want to because I first have to know if he has a s/o in order to ask him out. if I ask him out and he's w another to me that's kind of rude.) he always flirts w me like a lot even my friends leave us alone just to talk. AND HIS EYES ARE SO UGHH LIKE THEYRE SO COOL AND PRETTY AND IT JUST MAKES MY HEART MELT. when he came back from his ball tournament he felt really tired and sad but I came up to him and I was pretty sure I made his day ig. what do I do?