Stuck with Romantic trait. Please help!

I'm 2 years late to this conversation, but I found this thread today because I had the same issue. Had created a sim with the Non-Committal trait and decided to remove it, but he was still getting the tense moodlet from having the same job for too long (though oddly enough never got tired of his girlfriend?). Anyways, if anyone is still having this issue/comes upon this trying to find an answer, try this cheat: sims.remove_all_buffs

Worked for me, hope it works for you too!