You and Abby had a strange relationship that bordered on romantic, but she said it was just a friendship.
No, not only did it border on romantic, she kissed you. Friends don't kiss on the lips, right? So why the hell does she just avoid telling you she loves you, even though she feels it?
She's a damn coward who was ashamed to admit it publicly. This resulted in an argument between you and her that became heated to the point where you simply ignored each other during Manny's birthday party. However, seeing you flirting with someone else...
"Let's go home." She says initially in an attempt to pull you with her, but you insisted on staying.
So, she simply took you in her arms and placed you on her shoulder as if you weighed nothing, ignoring your anger as she carried you to her car.
And you know the most annoying thing? Abby said you were just a friend when she ran into her ex-girlfriend at that party.