[ARCHIVED] Romantic Relationships decay/become negative fast with no interaction

I'm glad other people are having a similar problem. My one sim didn't see her s/o for *max* 3 days (over the weekend) because she had family and skill stuff to do and when I checked on Monday morning, their relationship had gone from full romance and almost full friendship to full red romance and about a quarter red friendship. This was with no notifications or moodlets/sentiments about it and when I checked, her satisfaction was still 'fine'. Not sure about his.