Basically it's always the same chords except for a little variation in the bridge. It's first tab so it's not 100% accurate but it's still something :) Intro:

^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine) ^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine)

1st Verse:

^BmAm I the reas^Gon why you to^Dssed and turned last^A night? E^Bmverything's s^Guch a blur, i^Dt didn't come out ri^Aght.

A^Bmll of the sud^Gden it's cold^D and we're falling a^Apart. ^BmNo this can't^G be, please d^Don't leave me alone ^Ain the dark.

Chorus:

^BmAnd I guess w^Ge're really o^Dver, so come over, i^A'm not over it. ^BmAnd I guess w^Ge're really o^Dver, so come over, i^A'm not over it.

^BmLate night yo^Gu make me fee^Dl like i'm desperate^A, I'm not desperate. ^BmOh, a little ^Gbit possessiv^De, little miss obses^Asive, can't get over it.

Intro:

^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine) ^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine)

2nd Verse:

^BmI've never be^Gen a fan of l^Dong good-byes. ^A ^BmI'm at the fi^Gnish line and^D you're just way too^A far behind.

^BmIn the mornin^Gg I got in a ^Dfight with myself, I^A got the bruises to prove it. ^BmThen I swallo^Gwed your word^Ds and spit them righ^At back out.

Chorus:

^BmAnd I guess w^Ge're really o^Dver (over), so come ^Aover, i'm not over it. ^BmAnd I guess w^Ge're really o^Dver (over), so come ^Aover, i'm not over it.

^BmLate night yo^Gu make me fee^Dl like i'm desperate^A, I'm not desperate. ^BmOh, a little ^Gbit possessiv^De, little miss obses^Asive, can't get over it, no.

Bridge:

^BmIt's like a f^Gairy tale wit^Dhout a happy ending ^A(happy ending). ^BmBut then agai^Gn maybe we ar^De just pretending. ^A

^BmWhy does it h^Gave to be so ^Dunfair? ^A ^EmTell me that y^Gou care.

^BmAnd I guess w^Ge're really o^Dver, but come over, ^Ai'm not over it. ^BmAnd I guess w^Ge're really o^Dver, so come over, i^A'm not over it, oh.

^BmLittle miss (Woah), lit^Gtle miss (Woah), little ^Dmiss Woah), little miss ^Aobsessive.

^BmLittle miss (Woah), li^Gttle miss (Woah), little ^Dmiss Woah), little miss ^Aobsessive.

^BmLate night yo^Gu make me fee^Dl like i'm desperate^A, I'm not desperate. ^BmOh, a little ^Gbit possessiv^De, little miss obses^Asive, can't get over it.

Outro:

^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine) ^BmWoah, Woah, W^Goah (and some^D of you better steal^A mine)

Ashlee Simpson - Little miss obsessive