According to this article, you get smarter when you are married.
Basically it says:
" . . . because the changes that occur in the brain during the early stages of love are not conducive to intellectual pursuits. The feeling of euphoria, the sometimes obsessive desire to be with your beloved... all make concentration on anything else almost impossible.
. . . researchers have actually observed the effects of love on the brain. When people in the early stages of infatuation are shown photos of their sweethearts and told to think about them, areas of the brain rich in the chemical dopamine are activated. Dopamine produces very powerful pleasurable sensations....
As relationships mature, however, those areas are less responsive to the mere sight of one's lover. To be successful, the relationship must evolve from dopamine-driven euphoria to a more mindful cultivation of love and respect. Flowers and candlelight dinners help, but so do exploring and experiencing the world together. In fact, one area of the brain that "lights up" in these later stages of love is the cortex, the same place where information is stored and rational decisions are made."
Alright - so I quoted practically the whole article, but it's hard NOT to.
Explore, learn new things, go new places, try new things. But do it together. What’s the fun in doing all kinds of awesome things when there’s no one to share it with? Share it with someone, do something together and have fun doing so. Yeah – I’m going to try learning new things. New classes, new projects, new exploration of things I don’t usually do… I’m looking forward to it.
But I know that I can do lots of these things and experience and grow by myself as well. It's more enjoyable to do certain things with someone, but if you don't have someone to do it with, don't use that as an excuse to not do it. Still have fun, learn and get out of your comfort zone and then you'll be all the better when the time comes if/when you find someone to share even more things with.