Tbh in a sense this is the way tho…In the way that no singular event should be a defining victimization but instead to self-determine a better future. Complaining keeps you in the past, but having hope propels you forward into a future of possibilities.
Feel sad, feel upset, but don’t settle into the feeling. It is only a moment, and the way you respond will lead you down the path you choose with that response.
If you let go of the feeling that you were owed something (love, friendship, etc) in a relationship and just enjoy the time you spent together and what you learned from it, loss becomes a lot easier to deal with.
Also, people change, maybe you left the relationship before that happened. The relationship you remembered is not the relationship you’d be in now. I find that helpful to remember too.