I grabbed a passing stranger's waist and cupped her breast in my hand
What? please say you didn't do this?
I wanted to touch her breast.
It's her body and she gets to decide who can and can't touch it. You violated her and it's not right. You should have at least apologized to her.
The night was crazy.
Who cares how crazy it might be. How would you feel if a man groped you? I bet it would be awkward and uncomfortable.