Sleeping with other people

I can’t remember the name of a movie I’ve seen. I don’t even know if it’s an imdb movie or if it’s just on youtube..

It’s about two best friends which also happens to be in a relationship. Although they sleep with eachother, sleeping with other’s is not a problem. Or is it? The male(is blonde) sleeps with his best friends younger sister, and the woman(brunette i think) is a bit jealous, but isn’t showing it. The woman sleeps with this guy whom she falls in love with. She also gets pregnant and finds out that it’s the new guys kid.

The male’s best friend gets super mad and puts an end to his friendship with the male.

In the end the woman is showing off her work at an art gallery and her ols bestfriend (the male) comes to visit. There, ge also meets the teen-girl(the little sister) he used to sleep with.

Anyone who knows what this movie is called?

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