Guy and girl road trip held up in small town lose grip on reality

I think it's a recent movie, movie poster at a glance is red and white from what I remember shows a close-up of a guy and girl in the middle of desert.

I *think* the movie had 2 words in the title but could be wrong about this.

Girl is crouched or sitting (I think) and guy is standing behind but looking to the side. I
think they are both looking in opposite directions and they may be in front of a wooden hut or
some kind of very small building.

Storyline:
Guy and girl (or more) are on road trip to somewhere (may be L.A. can't remember) but get held up in a small town or middle of nowhere in the desert, and the longer they stay they slowly begin to lose their grip on reality and/or each other.