Renee was in Jakes MTC district. Therefore she went to the same mission as Jake, Aaron, and Calvin. Calvin could say hi to her, but he never had a conversation with her. Aaron however was her Zone Leader on the mission for 3 months. In addition to that. Aaron and Renee flew home together. Aaron was out 6 month before Jake, and because Sisters served 18 months instead of 24 that put Renee and him going home at the same time.
Jake and Renee were great friends on the mission, and whenever their paths crossed they made a point of catching up and maybe even flirting just a little bit. Jake found out that Aaron and Renee had gone on a few dates. Jake knew Renee and aaaron had gone out a bunch. Jake assumed, with what he know of Aarons reputation that he should just wrote Renee off. Then he found out from Aaron that tgey had never even kissed. She would keep shooting him down saying she wasn't ready for that yet.
Curious, Jake started talking to her, and attempting to resume flirtations... but age lives in Cedar City so he's never made a bog effort.