My 3-year relationship is hanging by a thread, i need help

Ok soo i have a 3 years relationship with mi bf, and he is literally perfect 4 me except for one little detail, he is EXTREMELY JEOLOUS. When we knew eachother he was 14 and i was 15, so cute, but before that i had like an "virtual situationship" and the dude didnt leaved me alone, honestly i was still chating with him bc i felt sorry for him, and he told me some things kinda inappropiate for somone with a boyfriend and i didnt placed any limits, i recognize it. My boyfriend saw the conversations, there was a whole trouble but at the end of the day i blocked my "ex" and all of that.

 And now we come to this last week.

A new guy started to chat with me on instagram and he is really cool and yk its always nice to know new people, he did like an inappropiate comment and now I PUTED THE LIMIT, so apart from that theres nothing weird. But rn my bf told me "yeah we have to talk really serious tomorrow, and we reached an agreement so we have to talk" and im like, dudee its just chating, its not that deep. Im actually so pissed off bc since ive been with him he has been jelous over EVERY MAN I KNOW and im tired, he was literally like "i dont want you to hug the dudes on your school bc it makes me insecure" and i was like CMON thats your problem, you have to check your insecurities on therapy. 

Adding to it, he is like "oh we will get married and children and the stuff" and honestly i dont want that for my life, i want friends and independence, i dont want to be tied to someone for the rest of my life :/

I really dont know what to do tomorrow, im scared but tired at the same time. Am i wrong? Am i a cheater? or  he is just really insecure for a relationship? Asking for help

PD: My bf has literally my instagram account on his phone bc he asked me to do it a long time ago, so that pisses me off too bc i think that why would he be so bad about my conversations if he LITERALLY have acces to all my conversations.