This is why there are the old sayings in English, such as, "Time heals all wounds." Then some people turn that around and say, "Time wounds all heels", meaning a person, usually a man, who acts like a "heel", an old-fashioned term for someone who acts in an ungentlemanly manner, like stealing a girlfriend, eventually will also be hurt. But in time you will eventually feel better.

It helps for me to immerse myself in literature. Short stories might be better than a long novel. There are many collections of American short stories which are poignant - they can be like an emotional workout that will make you stronger. O. Henry, Mark Twain, Dorothy Parker are some of my favorites.