Most Helpful Guy
It's not creepy, no, not at all. However, you need to ask yourself if it's helping you to let go or if it is keeping you stuck in the past. Acceptance is a vital part of getting over a breakup. Progress is built on that acceptance.
Most Helpful Girl
Hmm. I know some people might judge this as creepy but I don't think so. Music is music and maybe his voice still soothes you. Even if you're not together, it's okay to still listen to him as an artist or someone who sings.
Think of it this way. Ed Sheeran dates a girl, they break up; does that mean she's not allowed to listen to Ed's music any more?
You're not being creepy, don't worry. Just maybe don't tell people.