I always knew that the reason was something like that but after the latest chapter I clearly see a SasuSaku far in the horizon. As Tobirama said in this chapter the Uchiha try to seal away any love feelings in order to get stronger. Sasuke needed to get stronger twice in the manga so far. To kill Itachi at first and then to kill Danzo and the elders. Both times, a little before managing those feats or a little after he had a meeting with Sakura and in both meetings he tried to kill her.
He said his reason is he doesn't want any bonds with other because that keeps him back. We said that was completely wrong and Sasuke is not right on his mind but...but Tobirama disagrees and justifies Sasuke's stance.
So the genuine thank you before he left the village to Sakura really meant something.
p.s. Also Sasuke may have some feelings for Karin too but I can't say that for sure yet.
He said his reason is he doesn't want any bonds with other because that keeps him back. We said that was completely wrong and Sasuke is not right on his mind but...but Tobirama disagrees and justifies Sasuke's stance.
So the genuine thank you before he left the village to Sakura really meant something.
p.s. Also Sasuke may have some feelings for Karin too but I can't say that for sure yet.