What should i do about this boy who is 2 years older??

so this really hot guy at school has been flirting with me and i really like me and hes 2 years older and today at recess him and his friend quinton came up to me on my way to the lunch line and like he kept getting closer too me and after a little while we ended up holding hands and the only problem is i think he has a GF causeevery time i am by him shes all getting mad at him and today atlunch i noticed some girl had written on his arm " i love yooh" all in capitals.