The Boyfriend Pact by Emily Robertson

Sarah Harris has only ever loved one man, and then he married another woman. She nursed her broken heart, but it was time to take control of her life again. At least that’s what she told herself when she booked her ticket back to Chicago from her brother’s place after running away like the chicken she’d turned into. That’s when she found herself sitting next to a guy from her past.
Being around Jensen Monroe was easy. As it turned out, Sarah wasn’t as ready to let the past go as she thought. With one small thing after another, slowly she realized her heart might be ready to move on, but were she and Jensen on the same page or was she doomed to repeat the past.