Sal
Sal is one of Mitchel and Cam’s closest friends. She’s a wild party girl who used to hit club after club with the couple before Lily, their adoptive daughter, came into the picture. Because of this, Sal holds some resentment toward Lily, but later on in the series, she becomes a mother herself and settles down (a bit).
On the night before her wedding, she ends up making out with the venue’s bartender, much to Mitchell and Cam’s shock. Right before she gets married, she reveals to her soon-to-be husband that she cheated. Much to her surprise and delight, he admitted that he, too, also cheated the night before their wedding.