Typos: You have a few in here. For the first and third line, "took" is supposed to be "take". And the sixteenth line where it says "all those promise" it would make more sense if it said "all those promises."

You have a good poem here. I can understand everything that happened, and I can relate somewhat.

"he is a good guy
that one I can't deny,
he's doing it all right
leaving me with no chance,"

^ It is amazing how you still feel respect for the guy who stole your girl away from you. That means a lot. You are willing to over look the whole situation and still respect him.

"Why did you took the moon
out of my night?
why did you took the sun
out of my day?
you took everything away
and gave it to him,
it use to be us
now its you and him,"

^At the beginning of this poem, you were sort of blaming the girl for your sadness. However, your sadness transformed-

"I know you are happy now
and that use to be my greatest joy,
its just so sad
that your happiness is my sadness now,
cause it use to be us
but now its you and him...."

Somewhat into acceptance. Maybe not completely, but it is starting to...I find that interesting and quite...respectful. I think that you felt that the "new guy" wounded your pride yet you still think highly of him.

Good poem
4/5