Truth is, you get used to it.
It takes some time, but living single and alone eventually grows on you. You chew your food longer for lack of dinner conversation, sleep more soundly without a chatty someone stealing the covers, cuddling, or wanting something more. You save money on silly flowers or something special for no one special for no special reason, and you learn to be self-sufficient when sick, make your own soup and get your own toilet paper. You no longer worry about dying alone, just dying, and gradually forget the memory of a mind-blowing kiss, a hug or the unexpected touch of a caring hand. Truth is you get used to it and it grows on you like an annihilation of everything that might have been, drawing any willing heart, mind and soul closer to all the good things in your life that actually are.