How Can you go all day with out talking to the ones you love?

I just dont get it my husband travels a lot as you most know and he can go all day till night time till he talks to us. How is that I just don't get it. I talked with him last night around 9 and i have tried to call him twice today no answer of course. It is almost 6 here and that means it is around 5 there and no answer as always. I will no here from him until tonight after he goes out to eat with the guys and then comes in to his hotel room. Who can go all day like that if you are in love with someone you would want to know that all was okay at home before it had been 24 hours. This is so pushing me to my point of no return!!!!! I feel like I'm a ticking time bomb. I so can not take this any more !!!!!!!!!!!!