So I (M33) have been with my GF (F33) for about 2.5 years. We've been taking things fairly slow, and so far there haven't been any major issues. The first 2 years was long distance (about 4 hours drive), so we'd spend a week or so together then have a fair amount of time apart. However, this last march her living situation changed, and she ended up moving in with me since I have my own house. From the start this was agreed to be a temporary situation, to give her time to find other living arrangements.
I've always had my own space (besides a couple weeks in college when I had a roommate), I like being by myself. The last few months has really confirmed that. She has been about as wonderful of a roommate as someone could ask for, but just the fact that someone is always in my house is slowly getting more and more stressful. It's a very open house with only one big open space, a bedroom, and some side storage rooms, so we're basically always together (both our jobs have us home a lot, with periodic travel). I've been noticing that I'm waaaayy more productive when she's gone for a few days, and kind of freeze up more and more while she's here.
I do enjoy the time we spend doing things together, but I just can't get that time to recharge like I did when we were long distance. She seems to be doing fine with it though (she's basically had roommates all her life), and I get the feeling she would stay permanently if given the option. In every other way she is amazing, we get along great, have no major lifestyle conflicts (not religious, neither of us wants kids, enjoy traveling, etc). I just don't think I can live with someone, no matter who they are.
Has anyone here ever had or seen a successful long term relationship living separately, permanently? She's been looking at getting a big RV and parking it nearby, maybe moving it onto my property once we can build the proper hookups/infrastructure. This sounds good to me, I get my house back, she gets her own space, and she's still nearby so we get to do stuff together. But I also don't want to be unfair to her if this kind of thing just doesn't typically work out. There's always this nagging thought in the back of my head that maybe I'm just not built to be in a relationship.
tl;dr: Can I have a long term relationship while planning to live apart indefinitely?