missmeyet?
Bluelighter
I think it was because he blamed Jesse for Hanks death (since this whole mess was due to Jesse working with Hank) and was kinda doing a "you indirectly killed someone I cared about so I'm going to tell you about me indirectly killing someone you cared about."
This is exactly what I was thinking also. I was a little surprised that after walt "lost" hank that he still wanted Jessie killed but when I saw what he was doing telling him about Jane I realized it was because he blamed Jessie for Hanks death.