After reading a spoiler review which stated the heroine was with her boyfriend up until 57%, I dreaded reading this book thinking *unsafe/tstl*. Well, no she was not necessarily with her boyfriend, but she was kind of stupid.
Essentially Samantha (23) is on a road trip on her way to her best friend's wedding with her best friend's brother - the hero, Tristan (24). Steven, her boyfriend, bailed on her due to work complications, but said he would come directly to the wedding. Circumstances force her to drive with the hero across the course of a week where they begin to reignite old flames. Other than brief texts, voicemails and a single call she isn't with her boyfriend. Their relationship has its own set of problems, and when he prioritises his work over her once again, unable to attend the wedding they have a falling out and she texts him with a break up message (*problems/drama follows). But the point is only then does she become physically intimate with the hero (24 hours later. It's the thought that counts 😂). So no I wouldn't say there's cheating physically but emotionally the hero is someone she's felt suppressed feelings for, for a long time.
They have history from 6 years ago. He was a jock, popular and essentially a known "womaniser" (rumours with some basis but not much) as a teenager. She hated him until they shared a kiss. I think he liked her for a while, but she was quite anti towards him. Steven (the boyfriend) kissed Samantha and Tristan saw, but didn't see her push Steven away. Likewise she doesn't know Tristan saw, and in a jealous retaliation he starts flirting with girls in front of her. They end before they could begin. There's unsettled feelings and business until they see each other again.
Safety: obviously this is a kind of a second chance, and from my review above - she has/had a boyfriend for part of the book. They both obviously moved on in the separation but held some part of each other for a long time. I would even go so far as to say his feelings for her are far deeper. Misunderstandings meant their timing wasn't right. Despite that there's more push from him than her.
P.s. The heroine is soooo weird though. She writes letters to her best friend which she doesn't send, but writes out of comfort and seems to seek so much approval from her. Honestly wondered whether she had a thing for her.