Confliction...

I'm in a relationship with a man who has a 6 year old daughter. we found out we were pregnant last year and just welcomed our baby this year! I knew that this baby would be treated differently because everyone has always put the girl on the highest pedistool and thinks she is the most perfect child in the world. In excitement though I was looking at all the proud daddy posts on my boyfriend's Facebook of his daughter and his daughter and him. I've known him before his daughter so I have known first hand how close and special they were when she was born. After our little one was born, I noticed he wasn't as hands on with our baby and hasn't posted the proud daddy posts like he did with his first. I knew there was going to be a difference between the love of his children but I feel like he will always choose her over anything. We wanted to take the family to the fair and we had bought our tickets days before. As him and I were planning the day he told me he was going to drop baby off at his mom's because he wanted it to be just him, me, and his daughter. I was upset by the fact he didn't want the family to go together and how he didnt talk to me before already making plans to drop off my child for the day. I understand he is little but it hurt to know he didn't want to involve him in family day. I now have this habit and mind set of comparing them together at their ages. "You would have brought her when she was this age." "You did this when she was younger why not him?" I feel like I have resentment towards his daughter...