Because I want to be. I have a few casual partners and am regularly looking for others - but I find that I typically put more into relationships than I get out of them.

I think most people enter into relationships more out of a desire to remove uncertainty in their lives around having companionship (of whatever particular form they desire), and aren’t really being served by the relationship. But in life, uncertainty is the only constant, and we grow as people and can materially benefit by embracing it. So my take is that I will only enter into a relationship where I can reasonably expect that the relationship would serve me in achieving what I actually want in life, rather than simply being a crutch to avoid what I don’t want. And if I am lonely - then I am lonely. Loneliness is unpleasant. Good. One more unpleasant thing to work on acknowlaging and accepting to increase my inner tranquility.