I think a lot of people are having a knee jerk reaction after requited!Rose and unrequited!Martha and the coy Donna hints, but I actually love River as his wife specifically because he doesn't love her right now, he doesn't even really like her right now, and yet when he does love her, he won't be able to come back to the moment of her death because he's already there, which is just deliciously messed up. I love how Moffat uses time.