Kasumi has been addicted to dating sites for a long time. She was afraid of being rejected, so she was not proactive in love and has had a wide variety of relationships with multiple men. The reason she continues to use dating sites after getting married is because she had a very distorted view of love, so that she would be okay if her husband betrayed her at any time. And now that she has found out that her husband has been cheating on her, she may be feeling very lonely.