Don't worry - I can't give you a spoiler 'cos I can't remember exactly what happens.
I can't say I'm a fan of Lost tbh.
I enjoyed the first series but
imo the show never goes anywhere and the individual episodes aren't really watchable as standalone programmes.
Nothing ever really gets answered. There's too many loose threads for them ever to be answered - I think the producers are just hoping us viewers forget about stuff - like those mysterious island-shaking creatures )giant polar bears?) that run around killing people in the first series - but strangely nobody's worried about them now.
For me it just became a chore to watch it and try to follow it - seemingly ever-changing scheduling didn't help either.
I've heard there's a seven season contract for the show, so I think there's going to be about four seasons worth of fillers if that's true.