Hmm... I'm just trying to work this one out. I'm in a similar position in some ways, and am trying to see why I don't mind, yet you do. My DH goes off to Malaysia 2 or 3 times a year for just over a week at a time. Often, spouses will fly out to meet their partners and travel around the area a bit. I have done this twice now, once on my own, once with the kids. My kids are (now) 10 and 12 however. How old are yours? Also, we've been financially able to do this. Are you? That might be the issue.
My DH seems to enjoy going too, although he goes through the motions of whingeing about it a bit, as it's a 'full-on' week work-wise for him, and the jetlag is tough. But, he acknowledges that I have a tough time holding the fort at home, and goes out of his way to try to make up for that with little treats and thoughtful gestures. Are you feeling under-valued?
I work part-time (3 days) so that makes the time pass quicker. Being at home all week alone would make it tougher, certainly, specially as it's half term and the normal routines of school aren't in place.
We've been sleeping in separate beds recently too, purely because DH is an insomniac and cannot sleep if there's the slightest noise (like me breathing!). But we always start off together, and he nips back in with me at about 6am, so still feel close.
So, I guess there must be a sub-text at play here with you two, and it's only going to be got at if you sit down and talk it through. No use right now, I suppose, as I expect he's just left, or is about to.
Good luck - and I hope you have a nice time at centerparcs. Good forecasts - for later in the week, certainly.