Help me find a dramatic film about a young woman living with fear of abandonment.

Title: Help me find a dramatic film about a blonde woman who cheats on her boyfriend (urban setting, intense scenes) Body: I’ve been trying to remember the title of a dramatic film I saw, likely from the 2000s or 2010s. Here’s what I recall: The protagonist is a woman in her mid-20s to 30s with long blonde hair, living in an urban setting. She struggles with commitment and ends up cheating on her very nice boyfriend. There’s a memorable (and kind of lame) scene where the boyfriend shows up at her place unannounced, goes into her bedroom, and sees a used condom on the floor. She apologizes profusely, and he gives her another chance. There’s a bathtub scene where the boyfriend tells her she needs to accept that everyone in her life is going to leave her. Another standout scene: she’s in a bar, dressed to the nines, very drunk, and singing along to the jukebox. The acting in this scene is superb. The film is not comedic; it’s a serious, emotional drama. I don’t recall the actors’ names or the boyfriend’s appearance. Does anyone recognize this film? Any help is appreciated!