After a poster was released earlier this week, Magnolia Pictures has debuted the first trailer for the romantic comedy Life Partners starring Leighton Meester and Gillian Jacobs, which offers a stirring look at how relationships can get in the way of long-standing friendships.

Adam Brody stars as nerdy Tim, who falls in love with Paige, resulting in her first serious relationship. At 29, she hasn't ever been involved in a long-term commitment, except with her BFF Sasha. They used to only have each other, but this new guy is starting to change that in unexpected ways.

The nature of Sasha and Paige's relationship begins to shift, with Paige left on the side lines. Fearing she is being forever cast aside, the young woman rises to the occassion, hoping to keep her friendship with Sasha the same as it ever was.

But that proves to be futile in this first footage, which goes to prove that sometimes growing up does mean growing apart. Take a look, before Life Partners debuts in select theaters this December after its VOD premiere in November.