Considering what you posted, it sounds like he is emotionally abusive towards you. When anyone tries to stop you from having relationships with friends/family, that is a HUGE red flag. When someone blames you for all that is wrong with the relationship and doesn't admit to any of his own faults, that is another red flag.

I feel you are well within your rights to cut this guy off without another word from you. It sounds like he wants you as his possesion not as an equal partner. You deserve to be free and happy on your own without having to walk on eggshells and without being emotionally abused.

I know it is hard to break the cycle, but I think you are definitely on the right track. If you have to change your phone numbers, then by all means do so. If you have to change your email accounts, again, by all means do that. If you are on facebook or any other social network, consider blocking him from access to you there as well.

Be careful at all times right now. If you feel he may get to the point of more harrassment and/or stalking, go to the police and discuss what has happened and possibly get a restraining order as well. You deserve to be safe.

I wish you well and hope you can gather up the strength and courage to free yourself from this man. Take good care!