I agree with Kiya. It speaks to how close and connected you are that he called to give you the head's up. He could have let it go until Sat and then left on Tuesday but he didn't want to leave with you upset. He is trying to get things in place so that you have support while he is gone (and after that too!) and he wanted to give you enough time to cycle through the anger and sadness and fear and come in with your questions and allow yourself to be soothed.

I hope you can allow that. It seems that you need to make a plan for keeping him with you while he is gone - what can you do that will make him more concrete and available? My therapist usually leaves me a voice mail promising to return and reminding me about certain coping mechanisms. We've also worked on visualizations together so I can better imagine him with me. And he described his home office to me so that I could imagine him there when I knew he wasn't working. It helped to have a way to think about him. And once he told me a silly joke and said, "now when you feel very sad, remember this joke and me - and smile."

I know this will be hard, but look how well you can already verbalize the conflict. You're more than 1/2 way there!