Nervous about guy I'm dating going on vacation :(

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If you don't want to be the one worrying, then don't you be the one keeping tabs on him while he's gone. Do not text him (or at least first). Just let him has his vacation without reminders of his life at home. He will probably text you at some point. Fine. Just don't do the "must hear from you every day" thing. Not doing that will make him want to keep up with you more. The only thing that matters here is he is a free bird on vacation where he can never be found out. He either will or he won't, but all you really need to do is leave that cage open and if he comes back without pressure or prodding, he's not looking to escape.