They should feel guilty for trying to manipulate you. It is not you in the wrong here.

That he has brought his mother into this is petty and low. That they are trying to claim he has changed after less than two weeks is also telling. No one changes that fast- unless they are up to something.

If it is at all possible for you- block them. Both of them and try to separate yourself and end all contact with anyone you feel may side with him until you feel strong enough to face him on your own terms.

You are not in the wrong for any of this. Trying to guilt you for doing what is best for you is them being wrong and selfish.