Why would he give this reply, instead of giving a straight answer?

[Junior42]

He definitely answered a very weird way but he did answer you but i agree it seems shady way to answer it so i definitely feel where ur coming from seems like he answered the question without answering the question if that makes any sense
if you could please take a look & answer my question I would really appreciate it thank you so much

[awkward_author]

He answered your question. He's only been out with friends.

[2021biguy]

It sounds like you are accusing him and trying to start a fight. "Are you fucking anyone?" would start a fight.

[AndrésC64]

Looks to me like you did answer your question.

[CuriousMufuxka]

Definitely insecure.

[devoygf]

you don't trust him

[Anonymous]

It is evasive.