Loves me not

I can't eat or sleep,
How is this fair?
That I toss and turn,
Whilst you're free from care,
Work in 4 hours,
Yet I can't drift away,
How in the hell,
Am I gonna see out the day?
It just doesn't add up,
What you've done,
Only a week ago,
I was the only one,
Now you're with him,
Lay in his bed,
I'd treat you better,
You should be with me instead!
I never hurt you,
I always listened,
When tears emerged,
Said your eyes glistened,
Looked after you,
When you was sick,
Then you had a choice,
A man to pick,
And you chose him,
As he's prettier I see,
How on earth,
Can you choose him over me