For me, I used to pursue relationships because I enjoyed sex, and I wanted a willing partner to be available and close at hand.
As I've aged, the sex is still a part of it, but the ageing has also made me far less tolerant of other people's foibles, so I no longer see the convenience of sex being sufficient to over-ride my dislike of living with other people. I have a partner, but we do not live together, which is an arrangement preferred by us both. I still get the bonus of a sexual relationship but without the nuisance of having to share my living space with someone else, plus the fact that we aren't in each other's hair constantly means that I actually do far more enjoy doing typical 'relationship' things like socialising, short trips, visiting places of interest, cinema and so on when we are actually together.
It was different when I was younger. I put up with the drudgery and infuriating parts of living together because I thought that's just what you had to accept if you wanted a long-term sexual partner, but I've since realised there are plenty of people who feel as I do, and understand that living together is not a compulsory part of long-term relationships.
I am totally aromantic. I see romantic gestures and acts as completely cringe and wholly unwelcome in a relationship, so I don't crave the closeness of being with a partner 24/7, I don't necessarily miss them when they are not around, I don't hang on the door opening and feel flutters when they come in from work etc. I still enjoy company when I feel need of it, but it has to be on my terms, and I don't 'dream' about futures with partners and so on because they're just an NPC really, and who knows?, I might decide next week I've had enough and leave them.
I've always viewed all relationships as soluble. It does not mean I am not committed, it simply means that I view the commitment as open-ended, and on a 'rolling contact' basis. It's why I don't really think about 'where will WE be in 5 or 10 years', because I see that as folly. Humans, or at least, my perception of the majority of them, is that they are needy and overly prone to emotion. I hate clinginess, so any sort of "what ARE we?/where are we going?/what do you want out of this relationship?" type stuff I see as completely ridiculous. It just 'is'. Live life in the moment, because you can not predict the future. Either of us could be hit by a bus, drop dead tomorrow, or just decide we've had enough of the other one. We might just fall out over something trivial, and that will be the straw that breaks the camels back.
I also do not see any merit in the typical financial boons to sharing living spaces etc. To me, people who become utterly dependent on a partner are fools. I can not for the life of me understand SAHM's for example. To me, it's tantamount to actively asking to be left high and dry. It doesn't mean I can't empathise with someone in a difficult position through no fault of their own, but I can't help feeling a bit 'more fool you, you opted to put yourself in a ridiculously vulnerable position to begin with'. I value and cherish my total independence above all else, and I would not sacrifice that for anything or anybody else.