Something I should throw away, but...

Hello everyone!
I'm in my english class now and Ksenia ask us what is something we should throw away, but can't?

In my house, there is a room to iron where my family keep many old things. I keep old keepsakes, like my Rithmic Gymnastic set (three suits, a ball, a robe), old letters to my friends and a box where I keep keepsakes from my ex boyfriend. Here there are letters and tickets from the dates to the cinema and to cafés that we had.
I think that I should throw away this box, because when I open it, I get a little sad. I can't do it yet, but for me is an achievement that this box is not in my room now. I hope I'll have the strength to trow away it soon.

Regards!
Camila