Why do you think that he's not going to tell you goodbye? Has he done this before, where he didn't tell you he was going on a long trip?
Ya know, in your mind, it shows love if he calls you before you call him...
You know he isnt a phone person.
Even if he calls you, it doesnt mean love..its just a phone call.
It might help to take a look at that sort of thinking, and kinda break it apart.
What would it mean if he calls you? What else might it mean?
And what could it mean if he doesnt call you? And what else might it mean? And another possibility?
Take a look at the dialectics here...you feel it means one thing, but to him..to others..it may not. And simply because you feel it means one thing doesnt mean what you feel it is, equals reality.
This is a DBT skill and perhaps taking a look at DBT might be helpful for you in breaking some of this stuff apart.
Logically..you know he is bad on the phone. He may also be "testing" you to see if you call him. It may mean he doesnt want to speak with you, it might mean he is busy, it might mean a lot of different things..but the most logical assumption is, he isnt a phone person.
Now...you cannot change him. Can you accept this about him and be happy in the relationship?