Is My Wife Cheating on Me?

There is something wrong with my wife. A month ago, we had our first threesome with a pretty lady we met on a threesome dating app. Since then, I felt that she changed. She used to care for me so much. She would kiss me in the morning, before sleep and when I go to work. Now, she would forget to do that until I remind her. After I get off work, she would run to me like a little kid, hug me and prepare me a very good dinner. Now she changed. Is she lesbian? Is she cheated on me?