How to flirt with guys better?

okay so there is this guy that i like that i always talk/flirt with. (he kinda likes me too) but theres also this other girl that flirts with him too. but she flirts with him better and i think that he likes her more. he told me that he likes me but idk if its as a friend or as a crush. but it kinda looks like he likes her as a crush. so i wanna kow how to make him really like me