Got a relationship with my GF for 7 years now.
But at time she can be a pain in the backside, especially regarding financial matters. I think woman in general can never really be happy.
My GF got a good life (50.000 THB a month to spend on mostly herself and our daughter, 2 houses including one with a swimming pool, her own 3 rai farm, a car, no loans). I also got a condo recently which will be inherited by our daughter if would be gone in the future. But still only 40 years old, so hopefully that is far away ...
We do have a daughter together, so for the sake of our daughter it's better to stay together. But I wouldn't marry her (would have considered if she was as gentle as when we met, but people change).
Since a person is responsible for his/her own happiness and woman can never truly be happy while men certainly can (just enjoying working ,hobbies, friends), it can be better to stay single. You can have the upsides of dealing with woman without much of the downsides. In a relationship this can be harder to separate.