Also if I may add to Erodesu-x's reply, one of the wife's admirable traits, if not the most admirable one, is that she is prepared and is very knowledgeable about the world that she got into. The scenario you are hoping for is more for a woman who is married to an ordinary salaryman or any other ordinary person. While our Head Lady is born and raised in the Yakuza world, if I'm not wrong on that. She knows very well how egotistic Yakuza men are and having a lot of affairs is part of how men measure and compete with their machismo. Akitora may pose as someone different from the usual Yakuza in the earlier chapters but she admitted that she is prepared for Akitora's whims because she knows how different he is. Also, based on the last panel of her in Ch 6, she was by no means angry but rather intrigued and challenged, compared to Rogi who was fuming with anger and jealousy. She might even have recognized Rogi in that expression of hers.
https://www.facebook.com/LustyCatBL/photos/ms.c.eJw9zMENADEIA8GOTmDAgf4biwRHnqO1TPdKCwQrHfg4NhhDMtcoMT0R69N7Pb8p3f1Zp9t6~;nX~;6bN~;PcavZ~_~_F7YIARofVmuO4vLQnNg~-~-.bps.a.644983519031756.1073741857.509428529253923/644983525698422/?type=3&theater Dying right now! (≧∀≦)