A Poison Tree

I became irate with my friend, My anger expressed, it did not end. With my foe, I felt the same, But held myself back, my wrath untold. I nourished my anger with my fears, Both day and night, with many tears. I warmed it with deceitful guile. With crafted wiles with cunning styles. It grew incessantly, day and night, Until it bore fruit, it's brightly there. My foe saw it, shining there, And knew the fruit was mine to bear. One night, he snuck alas into, my garden fair, When pole was veiled, and none aware. In the morning, I saw said with glee, My foe under where I stood alas no longer free.