Translation:I have no interest in him.
If you listen carefully, you can hear a heart shattering in the distance.
I looked this up on Pleco since DL gave no explanation whatsoever.
In this context, 对 seems to be a preposition that means "with regard to; concerning."
I could be wrong, but that was the only definition that made sense.
I also found Google Translate says it can be translated to: Be opposite, so perhaps its meant in a sense like a, "I have no interest in being his other half" sort of thing. Really could use an official explanation