More updates:
I spoke to my BF that I need more space. I said that I will give him more space too and will respect his wishes, but he should respect mine too. He lashed out saying we can breakup but I was calm throughout. Finally he has promised to try on the condition that I never speak to my aforementioned best friends. I refused to do so but he has reluctantly agreed.

I have said that I will end things the moment he crosses another line and he agreed to it.

Is it possible for him to change - can I believe him if he does? Or should I just run away ASAP?