... I was hit on by my teachers, my sister's husbands, most of my friends' boyfriends and husbands .... NOT a good position to be in but, remember, YOU are in charge.
I believe in PERIOD SENTENCES. Statement.. PERIOD. No more negotiation, no more information, no more intimidation.
You do this by knowing FIRST OF ALL that HE is the person in the wrong, not you. People like this have spent their lives using the power to make you feel trapped and insecure. Here you are, questioning your thoughts, power and actions and he's probably doing this to several other conquests. You are a thing to him, not a person.
You don't have to answer his calls. You are accountable only to yourself. Threats from young woman are probably just a turn on to this fool. The more you speak to him the more he believes you want him. I agree with the other poster. Do NOT call him.
The BF admission has been done so that can't be taken back. He's going to do the Alpha male thing so expect that. But this is your problem, not your parents, not your girlfriend or your boyfriend, yours. And YOU can end it.
Men are trained not to hear women words. You don't have to explain your reasoning to him. Don't answer his calls or approach. He'll go on to the next conquest... and believe me, he has lots of choices... and many who will not turn him down.
He likes the hunt ... don't make yourself the prey. And don't allow him to win by feeling like a victim. Take yourself OUT of this mess and let it go. And don't personalize it. Men like him are predators. Nothing you do will stop it. Just get him out of YOUR WORLD.