I think some people are more flirtatious than others. I doesn't mean your husband is being disrespectful to you or the women he's engaging with.
As this is troubling you, you need to talk to him about it. It doesn't have or need to be confrontational which making demands would be.
This isn't something you need to deal with in (your) own head, it's something for you to discuss as a couple. You say he is and has always been very loving toward you, so maybe he simply doesn't know how this makes you feel, and he wont unless you talk to him.
I hope you can get this sorted
.