Husband talked to his ex wife on the phone for an hour

Maybe I'm being over sensitive here because I'm pregnant but yesterday his ex wife called him about their daughter. My husband put her on speaker because he was painting the babies room. I could hear their conversation. She was asking about school and then goes "I'm asking because I respect your opinion as a parent. Jenna wants to spend the night at a friend's house." My husband cut her off saying "I don't do that sleepover shit." She goes "I thought I would ask." He starts talking about how she knows how he feels about sleepovers. The conversation morphs into them talking about my husband sneaking out with his friends during a sleepover and he was hanging out with adults and it ended badly. And she was saying how that wasn't his fault and that it should be adults responsibility to not hang out with minors. They spoke about my husband's past on the phone for about an hour and they ended the conversation with him saying the answer is still no about sleepovers. I don't dislike my husband's ex wife. I just don't understand why he needed to be on the phone with her for a whole hour. He doesn't even talk to me about his teenage trauma for that long. She is a therapist so maybe she just has a way of getting people to talk about their feelings but I just felt some type of way.