Hi N.,
I was in a similar situation to this, and I was like you and didn't want to keep arguing about it. So I left it alone. It only escalated to the point where he was seeing someone, and then eventually had sex with someone else.
My advice to you is to go to counseling. I'm sure you will get a few free sessions through his EAP program at work. This will help you determine why he feels the need to have these types of conversations with other women. It will also help you learn how to speak to him so that he gives an honest answer when asked a question.
Just a few things I like to keep in mind.
1. Make sure you are attractive to him.
2. Make sure that you do fun things together.
3. Spend time to take an interest in what he likes.
I am not saying that any of this is your fault, but you are in the marriage with him, and only can control your own actions. I hope this helps, and good luck to you.