At the last minute, Selene came up with a better alibi, making Renz believe that those things just happened in her dream.
Renz didn't think that Selene was lying since that's the only believable explanation for those words.
First, grandma Elysa was still alive. Second, he hadn't met Selene's best friend yet. Third, he didn't betray her nor cheated on her.
In his mind, since Selene was drunk she thought her dream was true and began venting out her frustration upon seeing Renz on the rooftop.
After a while, Renz's laughter bubbled up in the living room.
"I was so worried for nothing. But I'm glad it was just a dream," Renz mumbled, caressing Selene's face.
"Don't cry… and don't disappear like that again, okay? If you are upset with me, tell me and be honest with me just like how you confronted me on the rooftop."