Go, Jealousy, Tormentress dire; 
On Lovers only seize: 
In Love, like Winds, you fan the Fire, 
And make it higher blaze. 
 
But Friendship's calmer, purer Joy 
Thou dost not heighten, but destroy.
Mary Barber
http://www.poemhunter.com/poem/on-imagining-a-friend-had-treated-the-author-with-indifference/