First love

Well today is this girls birthday.. She's my husbands ex gf (his first love) and she's been missing (probably killed) about 6 years..... I feel like he loved her more then me, he always thinks about her. He even has a car that she bought for him when they were together. And says he needs to get that car running again and paint her name on it!!! I understand that he misses her and all.. But he has a second child on the way( literally any day now) and he's always thinking about this woman!! And it doesn't help either that today is her birthday! He even wanted our wedding to be on her birthday, and he also wanted our son born on her birthday!!! Am I just overreacting??