When youre at the beach with him and see he gets a weird text, tell him it's better if he leaves
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I have not gotten the ending myself, but from what I’ve read, there are other choices you need to make to actually get this ending.
You have to choose all the negative options for the characters in the game, go to Ren’s apartment on day 4 and say you enjoy seeing it, and then on day 5 tell Ren to leave after you see his text.