Girfriend whiteout knowing has sex with the murderer of his Boyfriend

The movie is in English and I think it’s was recorded in the USA.

I can only remember fragments of this weird movie…
I just know its’s about a young couple who go in a road trip and they meet a guy who joins them.
That guy falls in love with the girl.
After a fight between the lovers the guy ends up killing the boyfriend in a motel that they were staying for the night. She thinks her boyfriend left her and she runs away with their new friend.

They end up having sex in the desert but then she accidentally discovers her dead boyfriend in the trunk of the car.  In the end, they try to kill each other and she wins.

What a beautiful love story. <3

Can someone tell the name of this movie? Thank you!

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