Accept and move forward, that's the best thing to do when you engage yourself into gambling, there's always a negative side if you don't know how to follow and practice that set limitation that you design for your gambling,.
Here it all depends on what "move forward" means. Many players perceive this as "forget about the loss and keep playing as if it never happened." And not "take a pause and think about your weak points." And therefore losses only increase in size, and over time they become much harder to forget.