In "Home", Sam revealed to Dean that he had visions of Jessica's death before it happened, blaming ♠ himself for not telling her or doing something about it. This was also the secret that he used to summon ♠ Bloody Mary in the episode "Bloody Mary".

Sam Sweeney\n\n Jess played along and they began a no-strings-attached  relationship, which continued ♠ after he found out she wasn't Katie. With time, their relationship went from casual to serious, but they broke up ♠ after he learned that Jess and Nick had kissed.