>> living every day through emma walker. oking back on her romance with riley. and they remembered a high school boyfriend who was jealous, possessive and even obsessed. >> he started to get very controlling of her. where she was, what she did, if she wanted to hang out with her friends. he was like, you're not going. >> he didn't want her to hang out with people. it was just him and her. >> and if emma went somewhere without him? he would text her 40 to 100 times. just blowing her phone up. and saying, emma, talk to me! text me back. call me. >> emma's parents thought the relationship was toxic. they had seen their daughter change. >> this new personality with riley in the picture was not one that you recognized. >> no, not with emma. her fun loving self was no longer. she was very closed off, more in her room. more angry at us. >> was it kind of like her spark had been extinguished? yes. >> her parents said riley seemed intent on driving a wedge between emma and her family. >> he would tell her that she did not really have