Please help me find this movie involving a man with lots of flashy clothes and a drug addict mom

This young man goes to Los Angeles and becomes involved with a wealthy girl. She spoils him with lots of clothes. He’s seen wearing lots of stylish clothes throughout the film. Later in the film the man drives his mother to a house for her to pick up something. She takes a while inside the house and he goes in to check on her and finds her with a needle doing drugs.

I thought the main actor was Ryan Gosling, but I’ve searched all of his films and I cannot find this one.