Tails saw Cosmo fall out of the sky and she landed a few feet away, knocked out. He knew she needed help. When she woke up she told them the dangers of the Metarex, an evil army of robots who want to destroy the Universe. And now all this time they have been fighting the Metarex, so Cosmo decided to throw a surprise "Thank You" party. Until Victor, Charmy, and Espio came and they needed their ship to be repaired. And I guess, somehow, he found out that Tails was in love with Cosmo, and here comes trouble. Victor had three plans and all of them sank to the bottom, except plan four. Victor kicks the disco ball and it's coming towards Cosmo! Then Tails jumps on top of her to get her out of the way. Then a good staring moment comes. On the second to last episode Cosmo sacrificed her life to save the Universe. After the Universe was safe her last words were: "Tails, whenever you need me, just look for me right next beside you." Two lovers never grow apart.
~Thank You

That night when Tails found Cosmo unconscious in the middle of nowhere, Tails knew she needed help.When Cosmo explained that she needed to speak with Sonic, she also didn't quite know why she was sent to Sonic's planet. As days and weeks passed Tails started to have feelings Cosmo, but then Cosmo got a meaaege from her mother saying she could save the Galaxy. She finally knew what she came for. But she had to sacrifice herself which was hard for Tails, he had to aim the sonic power canon straight at her! It was done, Tails knew he loved her he never wanted to do what he did.