This is my first tab, this is more for like an acoustic version of the song. Enjoy!
INTRO
E|-----------------------------------------------------|
B|-----------------------------------------------------|
G|-5-5-5-5-5-5-5-5-5-5-3-5---2-2-2-2-2-2-2-2-2-5-7-8-3-|
D|-6-6-6-6-6-6-6-6-6-5-3-5-5-3-3-3-3-3-3-3-3-3-5-7-8-3-|
A|-6-6-6-6-6-6-6-6-6-3-1-3-5-3-3-3-3-3-3-3-3-3-3-5-6-1-|
E|-4-4-4-4-4-4-4-4-4-------3-1-1-1-1-1-1-1-1-1---------| X2
[ Tab from: https://www.guitartabs.cc/tabs/p/patrick_stump/allie_tab_ver_2.html ]
VERSE
"wherever you find it..."
E|---------------------------------------------|
B|--8--8--8--8--8--8--8--8-7-7-7--8--8--8--8--8|
G|--8--8--8--8--8--8--8--8-7-7-7--8--8--8--8--8|
D|-10-10-10-10-10-10-10-10-8-8-8-10-10-10-10-10|
A|---------------------------------------------|
E|---------------------------------------------| Play this through verse
"im not broken hearted.."
E|------------|
B|------------|
G|-7-------2-7|
D|-8-------3-8|
A|-8-------3-8|
E|-6-------1-6|
CHORUS
E|----------|
B|---------3|
G|-5----3--2|
D|-5----3--x|
A|-x----x--3|
E|-4----3---| These are the chords, just listen to the song for the strumming patterns.