In the odd situations, whenever we cry, we expect the people to console us. Actually we want them to be back of us asking for the reason.
Few people though come to you and ask for the reason once or twice, we expect them to ask for many more times and so we reject telling the reason. Now the opposite person might feel that you might get much more disturbed if asked number of times and leaves your place.
In those situations, make sure the person who came to console does not go away from you without asking the reason. To overcome this, instead of rejecting to tell, just try to be silent and express it through your eyes that you are about to speak out. This can be done when you make some or the other hesitating sounds that are generally done by the people.