Villain offers to show a card

[Waylander11]

I was in a hand about three months ago so i'm a little vague on all the details but it went something like this
1-2 NL at the taj. Hero has ~$350 villain has ~$500

hero has 8c9c

villain is UTG+3 and raises to 12, hero is in cutoff and calls, blinds fold.

flop comes 8 9 2 rainbow

villain checks, hero bets $20, villain checkraises to $70 hero calls

turn is a 5

villain bets $125, hero?

-Villain is a tight solid player but i know he's capable of making a play.
-I've played with him before and he knows i'm TAG but i was also loosening up a little bit in previous hands and making some plays

Now here is where it gets interesting. I tell him i have a real hand right now. Villain offers to show me a cards for $30, I ask him if it matters which card he shows, he says no.

I think i should have paid to see the card but i don't see how it makes my decision easier, the hand i'm afraid of is a set and he said i could pick either card. What do you think?

something happened afterwards but i want to see the response to this first.