Don't feel stupid or consider it a weak spot... depression is a very vulnerable state to be in and it feeds off of triggers like the one you've encountered. Instead of adding to the fuel of just another reason to beat yourself up, see if you can turn it into a positive (I hate it when people say this, the word 'positive', to me so I can understand if you frown lol) and add it to a growing arsenal of coping strategies if a similar situation arises.