Your coworker is bored with her marriage and saw flirting with you as having some entertainment value. If she's gone cold on you, consider that a blessing. Absolutely nothing good would come out of you getting into any closer relationship with this woman. A 29 year old woman who discusses her marital sex problems at work is a total loser. Keep your distance from her. Also: never share anything personal about yourself with her. She's got a big mouth.