Welcome to SR!
Keep up your end of the No Contact.
You can't control what he does; you can control the ways you react.
Figure out ways to take care of your anxiety. Maybe venting here on SR, going to an Al-Anon meeting, taking a walk, exercising, sleeping, reading, whatever you like to do. Don't give your XABF power over how you feel.
I am very impressed at you for cutting the ties with him and maintaining all these months! Especially after being in a relationship for 4 years. Good job!!!!! Keep up your boundaries!!! (((hugs to you)))