I DONT KNOW WHAT TO DO🤦🏽‍♀️😭

My baby daddy and I broke up 3 years ago. We co-parent pretty good and now thats shes 6 she really likes having her daddy time. Sounds wonderful except it doesnt seem like enough for her. That I want mommy and daddy to be together syndrome ...is killin me. Her father and I do not clash well in a relationship I was completely unhappy and miserable. He doesn't tend to my needs mentally hes not very emotionally loving towards me etc.. the list goes on. As friends we are fine. I met my fiance around two years ago and he has been the best influence in my life and I couldn't be happier. Even my little girl likes him and we vacation together. Once we get married we will have to all live together. Im just worried she will have resentment because hes not her daddy or towards me because im not with her daddy. Recently she pretended super sick crying crazily about stomach pains for hours its 3am...so I call her dad to drive us to the ER. (I dont have a car) so I called him immediately. He shows up and MAGICALLY she all better. LIKE WTF I have to work in a few hours im so tired.. I have a feeling these behaviors will continue and idk what to do .....any parental advice