Lyrics [Intro: Both] Ah-ah, he-ey Ah-ah, ah-ah Ah-ah, he-ey Ah-ah, ah-ah [Verse 1: Camila Cabello] He knows Dirty secrets that I keep Does he know it's killing me? He knows, he knows D-d-does he know Another's hands have touched my skin I won't tell him where I've been He knows, he knows, he knows [Pre-Chorus: Both, Shawn Mendes, Camila Cabello] It's tearing me apart She's slipping away (I'm slipping away) Am I just hanging on to all the words she used to say? The pictures on her phone She's not coming home (I'm not coming home) Coming home, coming home [Chorus: Both, Shawn Mendes, Camila Cabello] I know what you did last Summer (Ah-ah) Just lied to me, "there is no other" (He-ey) I know what you did last Summer Tell me where you've been I know what you did last Summer (Ah-ah) Look me in the eyes, my lover (He-ey) I know what you did last Summer Tell me where you've been [Hook: Both, Shawn Mendes, Camila Cabello] I know, I know, I know, I know I know, I know, I know (Ah-ah) (He-ey) I know, I know, I know, I know I know, I know, I know (Ah-ah, ah-ah) I didn't mean it, no, I didn't mean it, mean it, no (Ah-ah, he-ey) Can't seem to let you go, can't seem to hold you close (Ah-ah, ah-ah) I know [Verse 2: Both, Shawn Mendes] When she looks me in the eyes They don't seem as bright No more, no more I know That she loved me at one time Would I promise her that night Cross my heart and hope to die [Pre-Chorus: Both, Shawn Mendes, Camila Cabello] It's tearing me apart (It's tearing me apart) She's slipping away (I'm slipping away) Am I just hanging on to all the words she used to say? The pictures on her phone (The pictures on my phone) She's not coming home (I'm not coming home) Oh, na, na, na, yeah [Chorus: Both, Shawn Mendes, Camila Cabello] I know what you did last Summer (Ah-ah) Just lied to me, "there is no other" (He-ey) I know what you did last Summer Tell me where you've been I know what you did last Summer (Ah-ah) Look me in the eyes, my lover (He-ey) I know what you did last Summer Tell me where you've been [Bridge: Shawn Mendes, Camila Cabello] I know, I know, I know, I know I know, I know, I know I know, I know, I know, I know I know, I know, I know (No, no, no) Can't seem to let you go, can't seem to keep you close (Hold me close) Can't seem to let you go, can't seem to keep you close (You know I didn't mean it, though) Tell me where you've been lately Tell me where you've been lately (Just hold me close) Tell me where you've been lately Tell me where you've been lately (Don't, don't, don't, don't let me go) Can't seem to keep you close, can't seem to let you go (I didn't mean it, though) I know you didn't mean it, though I know you didn't mean it, though (I don't wanna let you go) To me you didn't mean it, though To me you didn't mean it, though (No, no, no) (Can't seem to let you go, seem to let you go) I know you didn't mean it, though. I wanna know you mean it though (Hold me close) I know you didn't mean it though I know you didn't mean it though (Just hold me close) I can't seem to let you go, can't seem to hold you close [Chorus: Both, Shawn Mendes, Camila Cabello] I know what you did last Summer (Ah-ah) Just lied to me, "there is no other" (He-ey) I know what you did last Summer Tell me where you've been I know what you did last Summer (Ah-ah) Look me in the eyes, my lover (He-ey) I know what you did last Summer Tell me where you've been [Outro: Both] I know, I know, I know, I know I know, I know, I know (Ah-ah) (He-ey) I know, I know, I know, I know I know, I know, I know (Ah-ah, ah-ah) I know, I know, I know, I know I know, I know, I know (Ah-ah) (He-ey) I know, I know, I know, I know I know, I know, I know (Ah-ah, ah-ah)