Ignorance is bliss. Although it isn't exactly easy to ignore something, specially if you get the feeling that your actions and words can save someone from getting themselves in trouble.
Therefore thinking that it was for the best, especially in the long run Jesse ended up telling her close friend to think twice before making a choice and being totally serious about it. It's something she definitely wouldn't do but since she cared for her friend, she decided to do it. Lucas, her friend had taken a special liking towards a girl she knew well (Wicky). Wicky was a sweet and nice girl but she had a reputation when it came to members of the opposite sex. Jesse met her in school and though they weren't close enough she knew and heard a lot about Wicky and her doings.
So the moment Lucas told Jesse that he liked her she wasn't exactly surprised. You could say she saw it coming. She knew Lucas had a thing for her for a while. But when it came to the point where everything was actually about to happen she got worried and ended up telling Lucas that she didn't want Lucas getting hurt since Wicky had already hurt her classmate.
Jesse expected Lucas to get mad at her but was glad that he understood her intention and thanked her although. he didn't think much and said "It's all in the past". Jesse felt unsure if she did the right thing. She worried for a while then decided to be happy for her friend. Maybe things might work out and if it doesn't she'd warned Lucas so she wouldn't feel bad in the end.
Only problem is Wicky. Jesse didn't like her much and tries to ignore her excitement over Lucas. It was the same thing when she was with her classmate Alan. But she's finally decided to completely turn a blind eye and deaf ear to that issue.
Maybe she'll get to say "I TOLD YOU SO" at the end.
Either way not her loss. Ignore it and lead a blissful life. Jesse would be a happier person then.
