It's a song might be by drowning pool I don't think so though I don't know (its a rock song)
It goes w/ my one last gasping breath id apologize for bleeding on your shirt
And something about I hope he is a gentlemen
Hope you can help

You're So Last Summer
Artist(Band):Taking Back Sunday

Link to lyrics

He's right about the Taking Back Sunday song, but I think the one you are looking for with the "I hope he is a gentleman" is called "Grand Theft Autumn" by Fall Out Boy. Here are the lyrics.:D

Where is you boy tonight?
I hope he is a gentleman,
and maybe he wont find out what i know,
you were the last good thing about this part of town

When i wake up,
i'm willing to take my chances on the hope that i forget,
that you hate him more than you notice,
i wrote this for you, for you,
so, you need him, i could be him,
i could be an accident but im still trying
and thats more than i can say for him

Where is you boy tonight?
I hope he is a gentleman,
and maybe he wont find out what i know,
you were the last good thing about this part of town

someday i will appriciate in value,
get off my *** and call you,
but in the mean time i will support my brand new fashion,
by waking up with pants on at four in the afternoon
so, you need him, i could be him,
i could be an accident but im still trying
and thats more than i can say for him

Where is you boy tonight?
I hope he is a gentleman,
and maybe he wont find out what i know,
you were the last good thing about this part of town