Yeah, it's the best solution for him to re-assess whatever mistake he made during that failed session, instead of pushing his way to keep playing and most of the time the outcome will be against him, you need to be wise to keep that emotion and treatment towards your gambling participation, having that kind of understanding will let you to keep yourself in shape.
By introspecting ourselves on the mistakes we have made before, this will certainly motivate us to be more careful in every decision and action we take in the future. For wise and responsible gamblers, have good thinking because opportunity does not come a second time and this can be applied in gambling so that we remain consistent in maintaining good control.