I got a question for you: "I Hate U, I Love U" (stylized as "i hate u, i love u") is a song by American singer and rapper Gnash featuring American singer Olivia O'Brien. It was released on February 17, 2016, as the first single from Gnash's third extended play, Us (2016). The song peaked at number ten on the Billboard Hot 100. Outside the United States, the song topped the charts in Australia, a first for both Gnash and O'Brien, and peaked within the top ten of the charts in Austria, Belgium, Finland, Norway and the United Kingdom.

Answer this question: who sings the song i love you i hate you?
Let's think first:
The relevant information is: "I Hate U, I Love U" (stylized as "i hate u, i love u") is a song by American singer and rapper Gnash featuring American singer Olivia O'Brien.
Therefore, the answer is American singer and rapper Gnash featuring American singer Olivia O'Brien.