Your wife is getting comfortable with cuckolding you, and you are seeing changes in her.
You see that she is more confident about herself than she was in the past. She walks taller with her head held high.
You also see a spike in her self esteem. She no longer doubts herself or how she looks. She cares less about what others think about her.
You now see that she dresses sexier when you go out. She reveals more cleavage, more legs, more everything! She loves the attention that she gets when she wears sexy clothing.
Your wife has a higher sex drive. Women naturally have a higher sex drive than men, and that is brought out when she starts to cuckold you. Because of the sex that she is having with other men, she is giving you more (and better) sex than you ever had before.
You also see that she is acting more healthy. She eats better, exercises more, and focuses on improving her body. She realizes that this is the first thing that new men see, ans she wants to look her best.
Your wife is just overall happier when she cuckolds you. She is a more independent woman, who is less identified as your wife. She enjoys the freedom to make her own choices and act on them.