Fiancée wants me to prioritize his family over mine

I am so upset right now. Side note, we see my family as much as we see his family (parents included) not more, not less.

Every time my fiancée wants us to hang out with his family, I’m always there, with a smile on my face and making an effort to talk to everyone. I never tell him I don’t want to go and it’s even been my idea at times to go visit someone or to plan something with someone in his family. He, on the other hand, never wants to go with my family, he always has excuses and when he is there, he’s either “exhausted” to the point where he has to take a nap (he rarely takes naps during the day), his head hurts so he takes a nap, he’s sick so he takes a nap, or just makes any excuse to take a nap. My family is even starting to see a trend with him.

This weekend, I already had made plans (since beginning of July) with my family to do something together since my kids (from a different marriage) are starting school soon and we want all the kids to hangout (nieces and nephews). I told him about it then. His parents were supposed to come last weekend (coming from a different state) and they were going to stay with us last Saturday but they changed their plans literally last Minute. That Friday before they told us they were coming the following weekend (which is this weekend). I told my fiancée that I already had plans with my family but I was willing to only go Saturday and leave Sunday for his family. Tell me why he’s so upset and he keeps throwing it in my face that he’s not gonna see his parents both days because of me.

I came up with a solution. I have my kids this weekend and their dad has them next weekend so I told him I could just switch weekends with him. We could see his parents both days. And we can hangout with my family and my daughters next weekend because the whole point of seeing my family was so that they see my daughters and my daughters get to play with my nieces and nephews. HE GOT MAD! Like wtf?! He said he wants his family to see my daughters as well, which I get but I told him, we either see your family both days and not get the girls, or we see them one day and we get the girls.

So He told me to keep things how they were before so I did. But he came home today throwing it in my face again, that he’s not going to see his parents all weekend. I told him, fine, you go your way and I’ll go mine and we’ll just do that from now on and just see how well that turns out for our relationship. Am I wrong? I don’t think I should always accommodate to his family especially when they change their plans last minute.

I actually told him at the beginning of our relationship that I didn’t want to be that couple that always go their separate ways. because that’s not how I was raised and In my experience, that doesn’t work out. And he actually agreed so this isn’t something new I’m throwing at him. My ex and I did that and I regretted it because we were always distant. There are some exceptions. We’re not always together, he goes with his friends sometimes and I go with mine.