I think single people all go through that 'I can do what I want' phase, and you'll hear lots of people really praising it, for a while, but then the loneliness will inevitably set in.
Cooking for one (or just having a crap diet), the sitting on the couch lethargy, the repairs or house thing that someone else could do a thousand times easier, the 'letting yourself go' because you've got no-one to impress, the holidays with no-one to share the memories with, couples/neighbour events where you're the awkward one in the corner... and probably way worse with kids, as there's often no support/buffer to help you through, it's 24/7 intense. Singledom all sounds wonderful initially, but the reality hits you like a tonne of bricks!
I think it's a real challenge these days as everyone meets online, just wants hookups, and/or has been burnt by bad relationships.
Men don't approach these days (after years of people telling them not to); they don't want to seem like they're harassing, so just be pleasant and smile at anyone you fancy, ask for help in the supermarket, don't be shy... they'll come :)