Ishtar sees the Gilgamesh has cleaned up his clothes and body so she says to him "Come to me Gilgamesh, and be my bridegroom; grant me seed of your body, let me be your bride and you shall be my husband I will harness for a chariot of lapis lazuli and of gold, with wheels of gold and horns of copper; and you shall have mighty demons of the storm for draft mules."
Gilgamesh does not agree because all of those who she has been with before are either suffering or are dead, he does not believe she is a good person or the one for him, she gets offended. " There was Tammuz, the lover of your youth, for him you decreed wailing, year after year. You loved the many coloured roller, but still you struck and broke his wing; now in the grove he sits and cries"
Lets kill him!
Ishtar is so offended she calls on the Bull of Heaven. "Ishtar opened her mouth and said again, "My father, give me the Bull of Heaven to destroy Gilgamesh. Fill Gilgamesh, I say, with arrogance to his destruction; but if you refuse to give me the Bull of Heaven I will break in the doors of hell' This created a lot of trouble for Gilgamesh and his brother Enkidu in the future.
Anu gave Ishta the Bull of Heaven and he continued to get the revenge that she wanted. "When they reached the gates of Uruk the Bull went to the river; with his first snort cracks opened in the earth and a hundred young man fell down to death." He continued to kill and it upset Gilgamesh and Enkidu and they went out on a mission to kill the bull.
Enkidu and Gilgamesh saw this happening they killed the Bull of Heaven. "So Gilgamesh followed the Bull, he seized the thick of its tail, he thrusts the sword between the nape and the hons and slew the Bull. When they had killed the Bull of Heaven they cut out its heart and have it to Shamash"
In result of this happening Enkidu died because the death of the Bull of Heaven upset the gods. Gilgamesh had to reflect on his actions and it changed him as a person. Rejection can turn to revenge and revenge can turn to grieving. This made for a road ahead which was not so pleasant for Gilgamesh.