These generalities are technically true but they don’t necessarily make the heart hurt any less. Companionship, love, romance, is not hard to forget about once it’s gone. This is because the emotion of love technically changes brain chemistry.
Love is similar to an addiction. Many recent studies show that love interacts within the brain much like an addiction complete with the withdrawal symptoms. Brian D. Earp, Olga A. Wudarczyk, Bennett Foddy, and Julian Savulescu have researched into this exact phenomenon to find what that exactly means and how to help.