Is my babe cheating?(i'm 15, just lost my virginity and need help!!!!)?

Okay my guy and I have been dating for 6 months now, we had JUST STARTED ,and since school started he's been checking this other chic out, she'd kinda pretty,by the way he's 15 as well! and lately there hasn't been any deep interaction but.....they talk ALOT and i have homeroom with her and he checks her out and when i notice he switches back to our conversation, i'm like a really really beautiful girl, but i feel like he's using me until he can get her, guys what is your insight on this scenario, and ladies please help!!!