I don’t understand my emotions!!

So I see my fiancé only on weekends, becomes he moved an 1.5 hour away a month ago. I love him to death and miss him all week, and get very exited when weekend is coming. But I have this weird thing that right before I see him (like an hour before) I will find a reason to get mad at him. If I don’t find a reason I am cold when I see him. I don’t know why I do this!!! It like I need time to warm up to him.. We’ve been together for 4 years and this didn’t happen even when we were apart for 3 months...

What’s wrong with me and how can I fix it? 😭 He obviously gets hurt by this and I don’t want to do this to him, but still do...