You called his bluff. He wanted to have his cake and eat it too, but he wasn't counting on you having self respect. You did the right thing, and if you go back to him now there's no guarantee his behavior will change, plus you'll be compromising the boundary you just set.
Yes, even if opening up the marriage didn’t do it, those words tell you it’s over, just a matter of when.
You called his bluff. He wanted to have his cake and eat it too, but he wasn't counting on you having self respect. You did the right thing, and if you go back to him now there's no guarantee his behavior will change, plus you'll be compromising the boundary you just set.
Your friends should be supporting you, not him.