If the person is taken or lost interest , then surely it is too late.

its right the earliest time when you feel its too late to do something~

Hi... No it is never too late to express your feelings for someone but it could be too late to take action...

ur late already

There is no timing for telling the truth! Feelings are something very important ... and we never know how they would affect to the others ... we can only suggest that, but we can not be sure. It is just ... some courage needed to convince yourself to tell the truth. But truth is a truth and shouldn't be kept in secret. This is my humble opinion.