why does he want to steal the necklace again? is he going around stealing stuff???

Lmao yea the stone it has is pretty expensive apparently

He's a thief. He's done many jobs before but was thinking of retiring after this job. But instead of that he's offered more jobs. So he's trying to wrap this one up but he's falling for the little fucker so he's vacillating and taking too long to search. So he's a thief masquerading as a body guard only.