GF thing... both funny and annoying

I have a brother and sister I made after the release of GF. They have doppelgangers (same name and everything) in-game and every time one goes out (the ones being played) the doppelgangers appear at whatever venue the played sim is at. At first I was like 'ugh' and then one of the played sims got an S.O. and they went out on a date. So here is played Sim, their date, and the doppelganger at Villa Bovine. Dinner is going smoothly until the date gets confused and starts talking and flirting with the Doppelganger. Played Sim gets jealous and ends up in a catfight with the doppelganger. The date is confused because 'what the heck just happened?' and I'm laughing. Ah, Sims 4... you are crazy sometimes.