Don't Trust Anyone But Yourself

Katherine Reid had mastered the skill of being unnoticed by now. Her two friends, Millie and Athena, were the best friends she told everything to and the ones she depended on. But, one day they stopped talking to her. Then she became alone.
To end her loneliness, she made an account online and started to talking to a bunch of people. She came across this one account that caught her eye-it was a guy that was just like her and she instantly fell in love.
They decided to meet up one day, but the day that they were supposed to meet, his account got deleted. Everything was gone their messages and photos. After everything was gone, Millie and Athena started to talk to Katherine more. She became suspicious. Why were they talking to her all of a sudden? Were they the ones that had something to do with his account getting deleted?