Is it wrong for me to think this way

He

Husband lives 45 mins from ex wife’s school district from his son, there is a school festival going on for his son tomorrow and my husband has placement for him that day. Ex states she will just meet him there at the festival and they will all spend quality time with their son alone. I can’t make it because I have to pick up my kids from school and by time I get there it will be over. She’s not bringing her fiancée and I told him he should tell her it’s daddy bonding time together. She is an attention seeker always texting and FaceTiming him at all tones of night to make sure he remembers their family. I feel like I’m out of the loop but I know he wants to be their for just his son and she wants more? Again how would you react to this? I’m not jealous by all means but she’s the one who didn’t want the family and I can’t come with because my other obligations for my kids. There is a gamy dinner then games, really awkward to me.