high school crushin

i'm 16 and i've had a "crush" on the same guy since I was about 14. we've hung out, and he's the only guy i've ever really done anything with if you catch my drift and he was my first kiss. We go on and off and go months w/o speaking. We were steady talking the beginning of the school year but he completely ditched me and got a gf randomly but apologized to me for what he did bc he knew i was hurt (and bc he promised he would never do it again but did). idk if theyre still together but i really miss him and think about him constantly. any advice? i wanna move on but i also want him to know how i feel bc i never get the chance