He's Just Not That Into You

talking about the success of relationships but sometimes how it is not always a happy ending and discovering the truth about certain relationships.
The explanation of things not working out in marriages as affairs occur and also they fall out of love so this goes against the representations of relationships have happy ever afters.
Showing how even being in a relationship for a long period of time (several years) doesn't mean you have to get married, although the woman in this says "its going against tradition\nature". Believing that marriage is the follow up from the relationship. (man not wanting marriage, not believing in it)
Girl wanting to date men and then becoming obsessive, calling his number and waiting by the phone.