Eminem is this love ft 50 cent
I think you may be thinking of a different song!
The song "I'm Not in Love" is actually a collaboration between Will Young and Gareth Gates, and it was released in 2002. It's a cover of the 1974 song "I'm Not in Love" by 10cc.
However, Eminem and 50 Cent have collaborated on several songs over the years. One of their most popular collaborations is "Patiently Waiting", which was released in 2002 on Eminem's album "The Eminem Show".