[Verse 1]
Did he tell you you're the only one? (oh-oh)
Did you introduce him to your mum?
I bet "Boys of Summer" is your favourite song (oh-oh, oh-oh)
Yeah, me too
Did you lap up all the clichéd lies?
A book of poems on The Northern Line (oh)
Did you wonder where he went some nights? (oh-oh, oh-oh)
Yeah, me too

[Pre-Chorus]
I know it's out of the blue
But I've got something to tell you

[Chorus]
My boyfriend is your boyfriend
At the same time, at the same time
He fooled me and he fooled you
With the same lies, at the same time
Let's make a pact that we never go back
He don't deserve me or you
'Cause my boyfriend is your boyfriend too

[Verse 2]
It's kind of funny when you think of it
There must have been some times we almost met, I know
Jumpin' in and out of the same bed (oh-oh, oh-oh)
Yeah, me too
Same sleazy weekend in a slick hotel
Locked our love on the Paris bridge as well
Said he loved me from the day we met (oh-oh, oh-oh)
Yeah, you too

[Pre-Chorus]
I know it's hard to believe
I've been thinking the same thing

[Chorus]
My boyfriend is your boyfriend
At the same time, at the same time
He fooled me and he fooled you
With the same lies, at the same time
Let's make a pact that we never go back
He don't deserve me or you
'Cause my boyfriend is your boyfriend too

[Bridge]
(Shared the love we made)
Oh
(Made the same mistakes)
I know how you feel
(I feel just the same as)
Same as
(You) You
I feel so stupid that I couldn't see
I never thought that this would happen to me

[Chorus]
My boyfriend is your boyfriend
At the same time, at the same time
He fooled me and he fooled you
With the same lies, at the same time
Let's make a pact that we never go back
He don't deserve me or you
'Cause my boyfriend is your boyfriend too