I didnt miss it. I guess you took a different path/route for the "(could even say her defending lifeguard instead of been honest when Hubby recovered was a betrayal and cheating" and seems i took another resulting in different experiences. As of mine, yes, she did agree to go on a date, but it was only to shut him up, but she still looked for a way to cure her husband nonetheless, she never gave up on him despite that. she never really felt anything for the lifeguard but annoyance. In my part, she never really liked him and even tried to avoid him as much as possible. When husband recovered he got so pissed that he even said "yes, im the husband" and the lifeguard was all wide-eyed open mouthed, she looked at the wife and was like "but i thought you're husband left you" and waifu was like "no, he never left. he was here all along" (hinting the lifeguard that it was only he who assumed that the husband left because of his arrogance and greed to get another pussy) and other lines as she finally found the comeback she needed to shut the lifeguard up. That's why I said "Why does this have a "cheating" tag? none of them ever cheated"
As I remember you had 3 choices just before the meteor shower right? Story wasn't poorly written. In the perspective of someone who has knowledge about script writing i'd say author nailed some points in plot. At least on the route i've taken.