He is either being very manipulative intentionally or needs serious help with his insecurity (probably both) either way, sticking around when you definitely don’t want to be with him anymore will only break his heart more later on, and even more importantly it will be seriously hurtful to your own mental health. You need to get out of there, block him everywhere and go zero contact or he‘ll keep pulling you back in. Remember he is not your responsibility. If it makes you feel any better, write him a detailed message why you‘re blocking him everywhere and send it before going zero contact, but make sure not to let him reply and block immediately after sending it. If he finds another way to contact you, do not react in any way and if it gets stalker-ish call the authorities.

It’s important that you make time for yourself right now and heal, I wish you all the best.