Jon Gosselin 's first interview together with girlfriend Hailey Glassman , only on ET: Could it be their last? Will they split up as ET cameras roll? Last night Hailey broke down in front of our Mary Hart as Jon watched. At the beginning of the interview, Jon did not intend to participate. He sat just five feet away, listening. Then, he finally decides to join Hailey -- and that's when the conversation turns to estranged wife Kate Gosselin . "I tell him all the time that he ...