Did you know I had an affair with a military wife right after graduating high school?
I did not, how surprising! Why did you have an affair with this married woman?
She said that she felt lonely because her husband was away with the military.
It's not entirely your fault, but you should try and avoid starting a relationship with people you know are married. However, it was on her as well to stop the relationship from progressing.
I just think she needed to spend more time with her husband.
Married people get lonely fast when they have a spouse who spends time away. You need to comfort her but not with sex. Try to be more careful and control your urges to reciprocate next time.