Your article is poorly thought out, and thus, makes no sense.
You're making equivocations throughout, rather than sticking to one definition of what being "single" means.
First off, the study that found that single women were the happiest statistically speaking, meant unmarried women by choice. It did not claim that all unmarried women were happier or that married women could not also achieve happiness.
The biggest take away from that study is that marriage does not make women happy, statistically speaking. It might be a factor in one's happiness, but it can't carry your happiness; it's not a magic pill for happiness.
Next, you're equating being in an unmarried romantic relationship is not being single, which contrasts what the study looked at, which was marriage. That would be fine, but you can't compare the two and say it disproves the study. It doesn't. Apples and oranges.
Finally, you're equating same sex companionship with a romantic relationship with a man to attempt to disprove the study. Again, the study never made the claim that relationships are not important for any human.k, man or woman. They're critically important. All it did was highlight that placing romantic relationships in a place of primacy or superiority to other relationships (sometimes to the point of excluding other relationships) does not make women happy, statistically speaking. More often it leaves you feeling isolated and depressed, statistically speaking.
I'm guessing you read some articles by women thrilled with single life, felt triggered for some reason, and missed the point entirely.
Which is this. Being single is not a horrible state. It may be permanent, it may not be. It does not determine one way or another whether you are happy as a woman or not. Being single does not negate you as a person; nor does it bar you from loving relationships, some of which may be romantic in nature. You're also not required to hide yourself away and take the veil or whatever, in shame, because you don't have man in your life or a ring on your finger.
That's all. Ending the societal shame thrown at "Old Maids".
I'm wondering why single women reveling in their happiness with their life has got you so butt hurt? Their happiness doesn't take away yours any more than their unhappiness would increase yours. At best, that could be a weak kind of crutch, for a while.
Your article screams "At least I got me a man" energy.