Anyone else have a weird arrangement with the father of their kids when they are babies. My daughter…

Anyone else have a weird arrangement with the father of their kids when they are babies. My daughter is a month old and we switch turns everyone other night i watch her and the other nights my daughters dad does. Like it but at the same time. Its like we work better at not expecting from the other and doing it by our self. Not sure where this leaves us. I honestly just want the man i met. Makes me sad every day. Literally. No exaggeration. How do people get over the person they met and to the person who is like a complete stranger to them. I dont get how people can change THAT much in a short while. Never thought i would meet someone like him. The him i met originally. Who was so sweet all the time trust worthy. Caring and kind. And thats probably what i cant get over. So not like that anymore. I used to say he was and our love was like a country song. Every now and then ill get a glimps of the him that "i" knew but only last for a short few minutes.....