This was wonderful and tragic. The combination of:
1. Finding / digging out the dead in the accidents that you do help with.
2. The feeling that you could have/should have done more.
These have to be Superman's greatest challenge. I think in the long run these would be far more damaging than Lex Luthor with Kryptonite. If you let yourself internalize that burden, and tried to carry it all alone, it would eventually destroy your soul.
I don't think Clark has any idea of just ho much Lois helped him with her final speech.
Also, in his distracted state I wonder if he took notice of Lois talking about their future marriage? And so casually too!
Bob