What thought process guide your choice (chance for game, stay low on misfit, try to find a better fit?). Do you pass or try any other bid?
For instance, do you try 3♦ on the theory it is a better suit than his spades and he might have some diamonds? Do you try 3♣ on the theory that it gives you two chances to find a fit while pass leaves you in a misfit? Do you try 2NT in the hope to find 3NT vul or is 2NT for you longer diamonds and a shorter club suit for you? Or is 2NT for you a transfer to 3♣ where you can rebid 3♦ to show a better or worse hand than 3♦ immediately.

Help

You can tell from the spots, this is a real hand...
RHO passes, you open 1♦, LHO passes and parter jumps to 2♠.
The 2♠ bid is 6+ spades (usally six) and weak (generally 7 hcp or less... at this vul, will not be as weak as other vuls, but not more than a really yucky 8 hcp).