When your girl friend cry on your shoulder,what do you think?What if others?

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Sometimes what I have done make my girl friend down,she may felt really sad.When I realized that,I would comfort her,then she cried on my shoulder.At that time,I feel terrible,why should I did that thing to make her so sad,but I don't know how to deal with this,or I am not sure what is the best and effective way.Share your opinion,maybe you are a girl,then what will you think when a man cry on your shoulder?