If I were you, given that you strongly suspect this is coming, I'd play very cool.
First of all, think whether you're actually going to miss out on anything by being separated. Will your life be easier? It's very, very hard to live with someone who says he doesn't love you - you'll never have to do that again. Do you really want to fight to get someone to be with you who doesn't want to be with you?
I would just let him speak, say what he's got to say, then I'd say "Oh okay, that's fine" and put the phone down.
Do not react. He will feel all important. He'll feel that he's made the decision and that you yearn for him. No matter what it takes, don't tell him that it makes you unhappy.
You will be happier without him, you know. It'll be such a relief when it's over - you'll feel like you're lighter - like that first day of the holiday when you step onto the sand and realise how stressed you'd been.