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

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.108.335.1020 DX9
What expansions, game packs, and stuff packs do you have installed? Most expansion and game packs, most recently downloaded the lovesick expansion and the current updates.
Steps: How can we find the bug ourselves? Play with a sim couple in a relationship
What happens when the bug occurs? Romantic relationship bar depletes extremely rapidly
What do you expect to see? Relationship bar should not drop so rapidly
Have you installed any customization with the game, e.g. Custom Content or Mods? Never used.
Did this issue appear after a specific patch or change you made to your system? Yes
Please describe the patch or change you made. Downloaded the lovestruck expansion and the recent updates (at the same time).

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The romantic relationship bar for sims in a relationship rapidly decays. Most times just going to work for a day will completely eliminate a full romantic relationship bar for my married sims. Sometimes it will even appear full red. It’s causing it to be impossible to keep a happy relationship (they recently even got a phone call from their infant daughter asking why they were still together).