To be short and sweet is to be brief while still being satisfying or to the point, but in this context the person is pouring out their feelings lengthily and unsatisfactorily.
Consider the staetement "But still, hearing it all poured out so lengthily and unsatisfactorily when so much was on the line was dizzying.". Based on this statement, is "But still, hearing it all poured out so short and sweet when so much was on the line was dizzying." a true statement? Yes/no/unknown