Isn’t self-esteem a function of testosterone?

The idea of “involuntary singlehood” is as absurd as the idea of “involuntary air-breather”. Singlehood is the default state, you are not owed or even entitled to a relationship. You exit and remain out of that default single state only with the mutual and voluntary consent of at least one other default single… lose their consent and you are, voluntarily, becoming single again.