I feel like my husband still has feelings for his 1st child's mom they haven't dated in over 10 yrs…

I feel like my husband still has feelings for his 1st child's mom they haven't dated in over 10 yrs but whenever she's around he always starts acting weird 👀for example daughter is here talking to mom on iPad he comes takes the iPad and starts talking to her about her new haircut 😳when she dropped their daughter off he sat in the car and talked to her for a loooooong ass time his other daughter's mom he talks to for 2 secs...maybe I'm just being hormonal idk 🤷🏽‍♀️