frontstabber

One who does you a favor. Antonym of backstabber

Dude you left your keys at my apartment last night. Here you go.
Oh, thanks.
Yeah I also took the favor of carrying your recycles outside.
Wow you're such a frontstabber!
Did that acid wear off yet?

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Frontstabber

Someone who's up front about putting their knife between your ribs.

He/she was a frontstabber, so having your back turned wasn't the only time to be aware of what he/she was doing.