The question "is heartbreak the way humans experience it right now a good thing" is one of the more complex questions about the human condition,yes. My mental modell of all that is kinda like the following:

On an neurochemical level, the way "love" stimulates the reward-centers has been likened to "cocaine".Its an extremely strong conditioning, addiction even. So of course your brain wants to satisfy that condition by all means possible. If we have a look at popular culture, its kinda expected to have extreme reactions to heartbreak: people fall into depression, start rationalizing all kinds of really crazy behaviour (stalking, death threats, lifechanging roadtrips) etc etc.

To avoid all that you have to thoroughly impress on your emotional side that its over: thats why some people do the whole "burn everything that connects me with her", others just overwrite that old emotion with new (irrational)emotions like anger, hold a symbolic funeral, repeat it to youself everyday in a mirror etc.

Unfortunately I am not aware of studies about optimal treatment of heartbreak, but common wisdom is: NO contact at all in the beginning, allow yourself to grieve, find solace with friends/familiy, and somehow redefine your sense of selfesteem- take up painting/coding/comething you have always wanted to do. If one wanted to go the rational route: research neurochemistry, find out wether its really like cocaine-addiction, do whatever helps with cocaine-withdrawal. (or the other most closely related drug-withdrawal).