Is it normal for husbands to be this chill about other men's attention?

Hi everyone, I'm feeling a bit confused and wanted to get some perspectives. I'm a traditionally-minded married woman and I've always believed in a certain level of possessiveness from my husband. My husband is an amazing man in every way. He's incredibly caring, supportive, and always puts my needs first. He's a wonderful provider and we have a very happy marriage. However, I've noticed something that's been bothering me lately. Whenever we're out and other men interact with me, even flirt a little, he doesn't seem to react at all. He trusts me completely, which I appreciate, but I feel like I should see at least some possessiveness from him. For example, we were at a party recently and I was chatting with a few guys. He just excused himself to take a phone call and was gone for quite a while. I felt a little uncomfortable, even though I wasn't doing anything wrong. Similarly, he's perfectly fine leaving me alone with a group of men or even with a single guy. He'll easily make an excuse to go to the restroom or grab a drink. Is this normal behavior for husbands? Am I overthinking things? I'm starting to feel insecure about his lack of reaction even though I know in better looking and smarter than any average girls. Any advice or similar experiences would be greatly appreciated.