Red flags in bf (16M).

r/

I am 16F. Been together for 5 months. He follows girls that WE both know from middle school. He likes half naked posts of these girls that WE know. He still follows his ex and his ex private account on instagram. His friend is a red flag because he is talking to multiple girls at the same time. His music taste is concerning and hints at talking bad about girls. And this is what made me want to break up with him, he confused my name with his “ex talking stage.” He said something like “im going to do this to you exs name” and i was like what??? thats not my name. And he was like “i am so sorry I didn’t mean to do that.” and “My dad asked me if im still talking to her, and your names both start with a A so i confused them.” It really made me hurt and I cant look at him the same. Now a part of me wants to communicate how i’m feeling about these things to him. And maybe he can do something to change these things. Because i’m pretty sure he’s not aware. But i am not trying to build a boyfriend and tell him to do the bare minimum. My mom says we are young and it’s really not a big deal of course he will follow girls. But it’s extremely a red flag to me and I don’t see myself lasting with this guy unless he changes that. So should I break up with him??? really need advice

TL;DR: Boyfriend does things I dont like should I communicate these things to him or just break up with him?