Re: sims moodlet stays for 50 days

The buff might be named "CheatingIntensityBuff_Flirty"

Try sims.remove_buff CheatingIntensityBuff_Flirty

Do you use any mods like MCCC?  You can try removing it through that if you do.   Or try shift-clicking on your sim, going to more choices until you see "Cheat Sim Info" and then "Remove Moodlet" if you have that option.   I think MCCC adds that but I'm not certain.   lmk if none of that helps.