User blog comment:Woganhemlock/Monthly Question - February 2015/@comment-24258073-20150206220138

The Sims in the Sims 2 don't understand the concept of unrequited love.

If Sim #1 is in love with Sim #2, but Sim #2 doesn't reciprocate their feelings, Sim #1 will still accuse Sim #2 of cheating, should they see Sim #2 being romantic with Sim #3.