A five-year relationship ended with a short message saying goodbye.

This kind of person has no real feelings. Stop worrying about him (her). Such people have no sense of responsibility and true feelings. Just myself. It says that breaking up makes you really see his (her) essence-fickle and disloyal. This kind of person is as far away as possible. Even if he (she) later regrets and wants to turn back, don't give him a chance. Because the essence will not change. It's not worth nostalgia. Leave decisively. Hope to adopt.