You’ve made your position clear, stay no contact. If OW was truly out of the picture (and you have no idea about that and don’t go asking about it) perhaps no initiating contact would be something you would want to consider. You could try it now, however if OW is still involved I think there really is not much to be gained and just more hurt for you.
DnJ
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.