Oliver Tree's ex Melanie Martinez says she's been an "absolute wreck" ever since news broke that the popular singer died in a fiery helicopter crash. Martinez posted a heartfelt tribute on Instagram Stories after Tree and 5 other people were killed Sunday when two helicopters collided while flying over Rio de Janeiro, Brazil.  In her message, Martinez showered Tree with praise, writing that he was a true artist with a soft heart and a contagious and warm laugh. She also said it was difficult to

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