Help boyfriend issue!?

ohkay! am a freshman in high school and i have a boyfriend i been with for 5 months going on 6! so all of sudden i start liken this other dude name (J](just code names l0l].and hes sweet and cute!ao i told my best friend and she was like it is not wrong to like someone else wen you have a boyfriend!so i told him yesterday and now hes mad at me!an the person i like is like his friend!was i wrong for liking him?was i wrong for telling?but we are still together!