The context of the following conversation is Addison saw their aunt at the store.  She was trying to buy a birthday gift for Addison and it would have been a surprise gift.:
Addison says I spoiled my gift that my aunt wanted to surprise me with.
The friend responds oh how did you do that.
Addison responds I saw her at the store.
The friend responds I am guessing you saw her buying your gift.
Addison responds I did and she was not happy about it.
The friend responds I wouldn't either, spoiling the surprise.