He was looking forward to the party and meeting some of her friends. There weren't many opportunities to socialize in this small town. He also was so happy to be with her, pleased to be included in her circle of friends.
They arrived at the party and people greeted her. She didn't bother introducing him. He thought that perhaps this was just an oversight. After all, she hadn't seen some of these people in a while.
So he wandered off to meet people on his own. He stuck his hand out and told people his name, saying how nice it was to meet them. Eventually, he wandered back to where she stood, talking to a fellow that he hadn't met yet. He stood nearby, waiting awkwardly to be introduced. Finally, during a break in the conversation, he introduced himself. The other fellow looked at her and said "Are you two an item?" She quickly said "No" with such finality that he felt his heart shrink and shrivel in his chest.
The other fellow looked perplexed and cast his eyes down. She went on talking, ignoring the one she came with. He stood there awkwardly, hardly able to breathe.
Finally, he knew that he would not fit into her world. He was discarded just as surely as yesterday's garbage. He understood at last that a vast divide stood between them, a deep schism of the psyche that his love could not bridge. He turned to her and said "I am going now" and walked out the door to start his long walk home.
Note: This event actually happened although the details have been left unspecific. It reminds me how difficult it is to love someone who doesn't understand the concept, except as it applies to themselves. Narcissistic and alcoholic to the end, the divide will only widen until one of them is completely lost.