Does he know these girls irl, or are they just attractive instagram famous girls? if it's the latter, who cares? He's allowed to find other people attractive other than you, it's normal - How many male celebrities do you find attractive? Or how many men do you see in public that catch your eye, it doesn't mean anything except that you're human.
It's more an issue that you're:
1) stalking him on social media and have made an account specifically to do this.
2) questioning why he's removed emoji's from your name - I didn't realise this was even a real life issue....
3) concerned that he's not talking to you when he has college work or driving lessons - Would you rather he be uneducated and living off the dole just so he can talk to you 24/7?
4) willing to dump him before communicating with him - a basic skill.
Learn to communicate and express your thoughts and feelings. If you struggle with this now, you will struggle in every relationship.