Relationships based on friendship
It seems to me that a key theme in this film is the importance of friendship in a long term relationship. I like how (arguably) the most stable relationship in the film was between Julia and Adam, and that was because their relationship was based off of a friendship that evolved into romantic love.
Also, the relationship that failed the fastest was based on lust with very little else between the couple (Kristen and Jon). This films point of view just struck me as a very stable, and I liked that. I feel like rom coms these days are filled with neurotic people doing insane things, falling in love and everything about their relationship is a disaster. This film seemed more grounded and seeded in a deep need and desire for a stable life with a child.
I really liked it.