One thing that got me thinking is as follows:
1. If Dev thinks just that Ra loves him, he wld not do the swing thing together at Phool bangla, specifically because he knows that it is something that wife has to do it with hubby.
2. Secondly, he says i dont want to marry again.......
3. Third, he is asking in precap, whether she is keeping the vat savirti vrat, which is again a wife wld do for hubby........
So, going by these things, I think Dev knows that Rads is his wife, so I think he wants her to come out and accept it.......
he had three chances to confirm his doubt.........first in haridwar when Vish says that you sat in phere first.
Second, when Rads herself blurts out when he is sick....."koi kuch bhi kehe, per sack yehi hai ki..........."
Third, Rads confessing in front of Amma, thinking it to be Dev........
Initially I was very strongly thinking that Dev is kind of person, who wld NOt Keep quiet, if he knew the truth......but going by past three incidents and his taking the relationship so granted and troubling Rads makes me think otherwise.
Please share your opinion