On a single read, I felt that the script as a whole was quite spartan, though not necessarily to its detriment. The dynamic of Kate and Ruth's relationship wasn't exactly tangible, but the nature of jealousy and its affect on close friendships is something that honestly only requires sketching to be believable.

There's also an element of parable to the events that makes its vague dreamlike quality more forgivable, so Ruth's teary reveal that she regrets her actions and wants only for Kate and Tommy to live happily ever after is ok, even if we're given no real reason to believe that weak-willed Ruth would actually strive for such a thing. Especially considering it's absolute coincidence.

So, no, I didn't really have any investment in these characters, but I was nonetheless affected by the story, which possessed a very sincere and serene melancholy to the bitter end.