I think sometimes DH's get a little loony toward the end of the pregnancy. Friday night, DH was going to see our friends on the other side of town (DS and I were sick so we stayed home. It was onlyabout 45 mins. drive away). As he was getting ready to leave, he said he'd let me know later if he'd be home that night or staying at our friends' house. He said something like, well, you're only 1 or 2 cm anyway, so I don't think anything's going to happen tonight. He said something else about, if you need me, call me, and I'll see if I can drive home (depending on how much he'd been drinking--he's not a big drinker, but we both know to be careful if drinking).
This was when I started to get nervous. I told him, "I don't care if you go, but I do need to know that if I call and need you to come home that you will be able to come home right then." I also reminded him that last time around my water broke when I was only about 1-2 cm. I guess that kind of put things in perspective for him. He ended up not drinking and he did drive home that night.
I think sometimes they kind of "forget" how close things are. (This all went down when I was 39 wk +3 days.) Also, he was only 45 mins. away. I would be sure to say something to DH as soon as possible. He's asking you, so he sounds like he's open to what you have to say about it. If he missed the birth, it's possible you could resent him for a long time for it, and he would probably feel bad about it, too.
Good luck with the conversation!
Joanna, 6 years married to DH, Mom to 3-1/2 yo DS Owen and DD Taylor, born 6/14/10 by unmedicated