kiss passionatley, dont know the full story but scott and hayley are "on a break" because of the baby scenario, and because of hayleys heart problems due to strain of baby. And josie is feeling sorry for herself, and they are a shoulder to cry on for each other, and josie leans in to kiss scott but he backs off then grabs her and kisses her passionatley.
Hayley finds out because kim overhears scott telling alf about it, and kim tells scott if he doesn't tell hayley he will, they end up fighting but scott eventually tells hayley himself and she doesn't take it well.
Hayley and josie end up arguing which causes hayley to collapse and end up in hospital, which leaves josie to be the bad guy again. scott visits hayley in hospital and goes to grab her hand but she pulls away, which leads kim to butt his nose in and says "do you mind your upsetting the mother of my baby" another fight breaks out between them....
source:backtothebay.net