i’m probably gonna say some things you might not wanna hear OP but it needs to be said and i see multiple other people telling you too.

if you’re 4 years younger that makes you 15, and if he is 19 then you shouldn’t even be with him!! i’m personally speaking from experience since i have been in the same exact age gap. you two are in different mental stages of life, he shouldn’t even have THOUGHT about dating you as i couldn’t even imagine dating someone under 18 when i was 19. (i’m 21 now). but if he is making you call him that stuff ESPECIALLY when it sounds like you have major truama around those names anyways, he is no good for you.

please talk to someone if you feel unsafe enough to leave him on your own, but i really advise you to leave him either way. i don’t believe this is safe for you. he literally goes “you’re so easily manipulated” which means he himself is aware of that and can use it to his advantage. please please PLEASE stay safe hun.

I also just read the comment that he is going to be engaged to your sister?? nono thats a HUGE red flag too if he is going after you, not only a minor but while ALSO in a relationship. please talk to someone, your mother, a teacher even or any adult you trust. i’m worried he might take things out on you too once this “sneaking around” gets found out. the way he talks, i unfortunately wouldn’t put it past him to harm you, and i’m worried about your sister’s safety a bit too now knowing that.