I Need to Get This Off My Chest

It's not only my ex I miss. My ex is a single mother of a little girl who will be 2 in 4 months she started to call me dada since I was around so often and I took care of her in the morning so her mom can catch up on sleep. She loved me and I love her to i easily started to see her as my own flesh and blood. The last time I got to spend time with her before the break I was teaching her how to say bird she almost got it she's a smart little girl and a week later I saw her for a few minutes she was practically hovering in her high chair when she saw me and when she got down she ran to me on her short stubby legs. My ex gave me permission a few weeks before the break up to let me call her my daughter since she was seeing the bond form.... I miss my daughter