The pang of jealousy
"I love you, Oliver," Chloe said with so much love in her voice it sounded almost sappy. "I know," Oliver replied with a lot of emotion as well, but what emotion Tess couldn't tell. but it didn't matter it still hurt Tess incredibly. Possibly because those words that, she has wanted to hear for so long, were to her best friend.

And, Tess doesn't understand why it hit her so hard this time, but it did. She's heard this a million times, but, maybe that million and first time is the killer. And Maybe that's why she turned around and walked out with tears in her eyes.

Neither of the two noticed this, so no one went after her, not that she would've expected anyone to. Not that there was anything either of them could've said.

Lois is walking up the stairs to watchtower when Tess runs past her. But Tess doesn't care what smart aleck remark Lois was planning to say. "Wait, what's wrong?," Lois yells, which would've surprised Tess if she wasn't so wrapped up in her own emotions. "It's nothing,just business," Tess yells back hardly able to keep her voice from breaking.

All Tess wants is to be loved, to be told that everything was going to be ok. But Tess acknowledges that that will never happen, because the only person that had ever cared about her has moved on, and she has no hope for finding someone else. But, maybe she would have more hope if she had heard the end of Oliver's sentence "but...," he continued.