谁能告诉我WHO　IS　IT这首歌讲的是什么？

浏览了一下，没仔细看．大概是讲全心全意地付出所有去爱一个女孩，女孩却违背了最初的承诺吧．然后男的很伤心，就这样唱了．

who is it
michael jackson

i gave her money
i gave her time
i gave her everything
inside one heart could find
i gave her passion
my very soul
i gave her promises
and secrets so untold

and she promised me forever
and a day we'd live as one
we made our vows we'd live a life anew
and she promised me in secret
that she'd love me for all the time
it's a promise so untrue
tell me what will i do ?

and it doesn't seem to matter
and it doesn't seem right
'cause the will has brought no fortune

still i cry alone at night
don't you judge of my composure
'cause i'm lying to myself
and the reason why she left me
did she find someone else ?

(who is it ?)
it is a friend of mine
(who is it ?)
is it