Blind post,
If we are planning on call / call then raise for free showdown is best, then we can bet our river if we flush it.

If you expect Villain has pair then probably best to call / fold river.

This would really suck to get 3-bet at with little implied odds.

I think I end up raising here, chance we have best hand, we are drawing probably very live.

True

Edit :
Villain didn't bet turn, perhaps he was trying to scare you out, he may call if he has spade. He will definitely bet out if he has a spade and you can raise, so we are making this bet somewhere.

I think I check behind and call any river that doesn't improve.