Okay so here are my 2 pennies..
Now keep in mind I believe I am a lot more.. confrontational than you...
As we become parents, we no longer put ourselves first ( most), our children need protection and support, stable home and environment. Now some people get this.. their love for a spouse and their child outweighs their feelings of jealousy, hot temper and act on impulse. Basically common sense and maturity!
Now your fiancé, obviously can not put your child with your X first. So we can assume he might not be ready for a step dad type or relationship. He just made your child feel bad. He is also jealous of your relationship with your x... sounds like x is being a good father. Keeping civility, spending time with his child and not having a melt down.
But we all know who isn’t being civil. Your fiancé rather you argue with the x, him being a crappy dad and probably worse. That is not a good character in a man. That’s actually pathetic.
Now where are you in all this? Why did you not stop your fiancé when you first sensed him immaturity .. when he was only a boyfriend?Why did you not stop him right away?
And you add gaslighting, moonlighting, howling at the moon.. and what ever else.. you have the girls go to school, or maybe on a visit to grandmas house, friends etc.. and you sit this guy down.. and you tell him how things need to be! Basically putting your foot down! And if he doesn’t like it.. maybe he is not the man that would be good for you, knowing you have kids from different father and he ( your X) will be in your life forever! Because she will forever be your daughter!
You need to protect your children. And this is where you grow a pair or put your big girls underwear on.. and take a stand!
No mofo.. would ever make my child feel bad for having a good father!
I really wish your babies well and they will be well when you have less drama! Best wishes!
Edited: if there is nothing between the x and you, and he is a good father, he should always be welcomed in your home
( food or no food) To set a good example of a healthy, participating father relationship!