The music video uses close ups of the singers' faces to show their emotions, a constant tracking shot to depict the passage of time, and both singers wear normal clothing and have identical apartments to portray them as everyday people of equal importance who are the same.

2.  They use a lot of close ups on the faces
of the singers to show emotions that they
are feeling
 They use a constant tracking shot which
could be used to show the passing of
time

3.  Both singers are wearing normal clothing
which presents them as being everyday
people
 Also they have identical apartments
which could be seen as saying they are
the same

4.  Both singers have a long screen time
which shows that they are of equal
importance