OH!
Of course, another reason being single sucks, although this is a double edged sword, is not having anyone to go to movies you.... may not want to be associated with having seen.
For example, I saw Wall-E with a girl I knew way back in the day. She wasn't part of the group of people I normally hang out with and only saw her a couple times a year. With a girlfriend, I could be going out watching movies like that that adults.... shouldn't be watching... all the time! I remember watching Transformers when it came out with my ex.......... 3 times. Now who else would indulge me with that kinda nonsense? THREE TIMES! all in theaters.
Plus, I mentioned earlier that it's not so bad of a situation when you don't get to go decent restaurants and I said it's not so bad because you always have friends you can go out with. However, come to think of it, one good thing about a gf is that if YOU want to go out, you can be like "EAT FOOD NOW RAWR GO". And boom. None of this coordinating with friends BS.
Oh and I guess uhm, someone careing about you more than almost everyone else in their life is quite a thing to miss out on as a single person. I hear that's important.