Maybe it would help explaining what exactly she's doing (and I apologize if it's been said already) when she's flirting. If it's an innocent and subtle flirtation, I think we're all inclined to do so to a point, and we need to feel secure within ourselves to know it's nothing threatening to ourselves and our relationship. If you were to have a solid foundation between you two, this may not be an issue? I'm not sure.

My partner is particularly attracted to young women in yoga pants. What he'll do is track their privates as they move across space until they're out of his sight completely. He is no longer present with his family during this time. On my birthday, he stood up out of his seat and turned around, in order to continue watching a woman through a window, who had just left the restaurant (of course, in yoga pants). If I'm blocking his view, he'll crank his neck over me so he can continue watching someone in a sexual way. I can see his eyes scrolling up and down a young woman's body. Walking in parks and beaches is embarrassing.. total disrespect towards women, period. He claims he's "unaware" and must be doing so, "subconsciously".

Anyway, I'm mentioning my experiences as examples of what is NOT everyday "innocent flirtation" amongst 2 consenting adults. Is your wife behaving similarly? If so, you have the right to be concerned and upset.

At the end of the day, you'll have to question the severity of her behaviours and if she's truly being disrespectful. If not, then maybe there are other areas in your marriage that's making this scenario feel more threatening to you.