The whole song is played with an A barre chord for those who do not know what that is it is

e|-5-
B|-5-
G|-6-
D|-7-
A|-7-
E|-5-

That one chord makes up most of the song until it gets to the chorus which is

  Looking for love in all the wrong places looking for love I was wrong
e|------------------------------------------------------------------------|
B|------------------------------------------------------------------------|
G|-(b9)----------(b9)------(b9)------------(b9)-----(b9)----------(b9)---------(b9)-----|
D|-7-----------7-------7-------------7------7-----------7----------6------|
A|-5-----------x-------5-------------x------5-----------x----------7------|
E|-x-----------5-------x-------------5------x-----------5----------x------|

and he holds that last chord until he starts back with the A chord

That repeats the whole song until he gets to

       And all the time I looked for you
e|---------------------------------------------|
B|---------------------------------------------|
G|-(b9)---------------(b9)----------------(b9)-------|
D|-7----------------6-----------------7--------|
A|-5----------------7-----------------(b9)-------|
E|-x----------------x-----------------x--------|

Then it goes back to the chorus just listen to the song and it will make sense. Also, 
while he plays the A chord he does a down strum beat then this little up down type of 
pattern but everything is mostly just a down strum.