Do I have the right to be upset?

So me an my partner have been together for 16 years we have 2 Boys an I’m currently pregnant with our 3rd Boy, his auntie is having a wedding and has invited my partner to the day time an told him I’m only invited to the Night!! My partner has told her No he would not come without me so he also will only be attending the night Venue but I feel really upset I have been apart of the family for 16 years we have 3 children together I feel really upset that she would invite him without me. Am I over reacting?? I feel like I don’t even want to attend the night venue as I’m hurt that she wouldn’t invite me, this has also really upset my partner and put him in a hard situation I feel he should go without me as it’s his aunties wedding but he keeps saying No we go together... Please give your opinion