How big is my heart?

How do I take it when I realised someone has given away a present from me or worse still, given away a present given to me?

I would be quite mad in both circumstances. However, in the first case, I would probably pretend not to know about it and stay silently mad for a period of time. I rather not talk to the person before I get over it, else its just angry words.

In the second case, due to sentimental reasons, I would be madder. However, I do wish some friends know that certain circumstances are not by choice. I didn't choose not to be around when their presents are given away or thrown away. I didn't want it to happen either.

Is true generosity defined as giving away something that really matters to you? In that case, I doubt I am that generous.