A close encounter with Finn makes Rey realise what she wants...
Realisation
Rey was terrified Finn would catch up to her, or try to stop her. She felt terrible and awful about leading him on, letting things get so far and then leaving. But she just couldn't go through with it. Everything she'd had with Luke came screaming back to her. Having been a few minutes away from having sex with Finn made her realise how much she wanted to be back with Luke. To be in his arms again. To have him hold her.
She packed her bag, shoved her lightsaber into her belt and made her way to the centre of the base, where Leia was still working late into the night. With her rucksack slung over her shoulder, she approached Leia. "General."
Leia looked up from where she was working. The base was quiet. Most people had gone to bed.
"I, um… I didn't wanna leave without saying goodbye."
"You're leaving? You only just got back."
Rey's face was red from having welled up a little, and also from the alcohol. "I know. It's just…I..."
Leia waited patiently.
"…I need to see him."
Leia knew exactly what Rey was talking about. She didn't need to explain herself. Leia gave a friendly smile and a small knowing nod. Rey gave Leia a thankful look. Leia stood from her chair. Rey ran over to her and gave her a big hug.
"What about…?" Leia glanced at Rey's lightsaber, referring to becoming a Jedi and the rules which came with it.
"We'll figure it out. Right now, I need to be with him."
Leia smiled. "Go."
"Thanks for everything."
"Be safe."
"I will... goodbye, General."
"Goodbye, Rey. Good luck."
And with that, Rey turned on her heel and made for the exit of the base. She didn't stop, she didn't look back. It was dark and rainy. Rey ran all the way to the Falcon, boarded and prepared for her journey back to Ahch-To.