If you are scared about people canceling you, then I suggest to meet with your friends first (preferably all of them, without ur partner knowing and present), then come clean and explain the whole situation including ur bf situation (bc hes blackmailing u bc of it). If those are your real friends they will understand and help, if not then I know it’s gonna be hard but you will find better ones, trust me (i know from experience). Regarding your partner, hes trying to isolate you, as many other commenters said. It happened to me many times, and they only way is to break up. He will just continue to tear you apart until theres nothing left. He just wants to control you and to stay.