Thanks Cory! Your interpretation is very good. Deja vú in Spanish means the same. I didn't realize writing more lyrics.

It means nothing by itself because of the style of song writing. I am certain there is more context. However, in English, 'deja vu' is when you feel like you remember an event while you are in it, as if it had happened before. So, the singer is probably saying something like 'I've seen this before, and I'm emotionally hurting because of it.'