After the escapade that ensued between him and Lathebo, Sango retreated to his confine not out of the willingness to. He did it out of the desire to not want to continue his charade with the old man.
Back in his room, he threw his body on the bed with a heavy thud and a creaking sound released from the bedstand.
Sango should have bid his time more to extend the length of communication with Lathebo, to gain more information such as;
What is he and how does he know about the God Of Destruction? Or about him having a resemblance to the God Of Destruction.
There is no way he is buying the coincidental excuse story Lathebo narrated. A lot of flaws were present that made the story lacklustre and untrustworthy.
The way Lathebo was acting made it seem as though he was trying to get out of Sango information relating to the God Of Destruction or about the monster kind.