Straight male, and being alone doesn't bother me. Quite the opposite, in fact—I've come to enjoy my solitude quite a bit. I've been in committed relationships before, and I'd be lying if I said that I don't sometimes miss aspects of being in a relationship, but it's not something that bothers me.
I'm also not particularly interested in finding a new partner these days. My last relationship was ended by my ex, so I didn't choose to be single again at that moment, but I like it now. Not opposed to the idea of another relationship at some point, but it's not something I'm seeking or even thinking about with any frequency. I'm using my time alone to work on myself, my life, and all of that.