I recently was contacted by someone on a social networking website asking for X (just an example). Basically 'X' here is both my ex's name and current partner's name.
At first I thought they wanted to get in touch with my current partner, but since my current partner didn't recognise his name, I'm wondering if he is contacting me asking for my ex?
I had a really bad break up with my ex so I'm wondering whether to ask if this person is asking about my ex or just assume they are asking about my current partner?
Please help.

Its not your worry.

Leave that stuff to your ex. Disregard.

If your current doesn't know them, delete, or ignore. End of story.