Realm of Magic - So " infatuate " can't break up couples?

I have seen sims fight, slap and argue and all that (maybe it depends on their traits as some had mean or jealous trait); but the only time I had sims break up was when I told them to leave their spouse or write a mean letter on love day. I don't think they ever can break up on their own without mods (probably because they know not everyone wants to lose couples so they leave that more up to the players). I tried a love spell and they were more mad at sim for doing it and kissed the other sim. If their spouse was around, I assume they would be upset.