Find something else to divert your attention, or you can talk to your girlfriend (brother) and don't take it to heart.

You can also go to the playground for more than a dozen laps and vent appropriately, and your mood will be much better.

It turns out that my dog, which I had for five years, died, but it will be much better after a long time.

I hope I can help you, because I have tasted the feeling that I can't accept my partner's death.