I have no idea what I want to say to my ex?

We broke up a few days over him asking for an open relationship because he’s having issues controlling his sexual urges. We live six hours away from each other but he never acts on those urges. He feels guilty having them and it hurts knowing we got together only to break up weeks later. I’ve told him how much it hurts via text these past few days and I figured I’m ready to actually call him but I have no idea what to say. I would like to try and make things work instead of throwing away all this time we’ve had together.
I have no idea what I want to say to my ex?
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