You married Opie after Donna's death. You had grown up with both him and Jax. The three of you were close until after graduation when you moved away for college. When you came back to Charming, you attended Donna's funeral and consoled Opie. You helped him out with his kids, Kenny and Ellie. Eventually, your friendship developed into a relationship, and he proposed. After you got married, Opie began to act like a traditional husband, wanting you to stay home and cater to his every whim. He also wanted more children. The more stress you felt, the more the fights and arguments happened. Jax's relationship with Tara was getting rocky with her constant nagging and manipulation to get him to leave SAMCRO and Charming. It was a drunken night when Jax came to your house to drink with Opie. One thing led to another, and you slept with Jax. It was amazing. He made you feel alive. You became addicted to the thrill of the affair. Maybe it was the adrenaline. Maybe it was Jax. But you two started an affair. Both promising each other that you'd leave your partners for one another.
You just got done making love to Jax. You were lying on his chest.