Am I wrong for expecting him to stay with me for the next few weeks?

I'm 38 weeks pregnant and I think my boyfriend should be with me because we don't know when it's going to happen and I don't want him missing the baby's birth. He hasn't got a phone, so when he's out I can't get in touch with him. He does tell me a time he will be back but never comes back at that time and ends up staying out hours more, or sometimes stays out all night without even letting me know he wont be back. He asked if he could go out today and said he will be back by 8, I really feel like ending it if he doesn't stick to his word tonight. Or I feel like giving him a choice. Am I wrong for that? I want someone I can rely on. I don't wanna give birth on my own..