I (M 38), and wife (F 32) have been married for 6 years, we are both asian. It started in 2017, because she wasn’t satisfied with our sex life. I wasn’t comfortable with it at first, but eventually it improved our sex life tremendously. She started this journey by responding to her ex’s request to grab a coffee to catchup.

Over the year, her primary partner is her ex, where they would meet up whenever he’s in town (3-4 times a year). She went on dates, but she rarely sleep with them. Long story short, she’s really just seeing her ex throughout the year. She went with him to a cottage this past long weekend, and spend 4 days with him and his friends. It’s strange to see the pictures she shown me, it’s like a normal couple hanging out, playing card game..etc

She has 0 interest to be with him romantically, they dont even text or call each other unless he’s in town. She really opened up our marriage for her ex, and is that normal or reason to be concern?