Does he seem to be up to something or not ?

[Shanice]

Okay so there's this boy that's friends with a boy named Carlos that likes me . This boy sent me a message on Facebook talking to me about him and Carlos , then he write if I wanna do a prank on Carlos for leaving me on scene. We were then talking about it and without him knowing me he wanted to add me in their group chat. But after all of that happened he would act nice to me and when he sees me in school he says hi to me . Should I delete him from my Facebook for being sneaky ? .