Just make an extra house key so this isn't a problem in the future. If he rarely goes out with his friends, I can understand why he doesn't want you imposing a curfew on him. I think if he's having this one night out, its a bit immature of you to want him home so you don't get lonely. I don't think your request was ridiculous but I think your reaction to him not wanting to come home at a time you specify is.

If you are afraid you will be lonley, treat yourself and splurge on a long distance call back home.