Hello. If he has made his mind up to leave, there is NOTHING you can do to stop him...so don't bother. I know it's hard under the circumstances, but, with all your might, show strength...even if you have to fake it for right now. Be compassionate to yourself, first and foremost. That means caring about your hurts AND being willing to do something about them. Weakness is not attractive...strength is. But do it because it's good for YOU. It may feel counterintuitive, but being strong is the best thing you can do for yourself. This is hard stuff...I know. But there are opportunities to learn here, from people who have made mistakes, so you don't have to make them. Let him know that, although you don't want this, that you will be fine regardless. Actions speak louder than words. Take him off of your phone account...keeping him on it isn't going to change his mind. Do it, and be done with it...don't discuss it any further. By taking steps to take care of YOU, you're not going to be telling him that you're OK with this, and you're not going to be encouraging him to do anything...you're simply going to be taking care of YOU. Period. This is something that you need to do regardless of what happens. It shows strength...and that is something that always benefits you, no matter what.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.