
Originally Posted by
DaVeyWaVey
My interpretation was that Stacey confessed to Bradley when they had a heart to heart in her room and promised "no more secrets". Bradley running on the roof was to cause a diversion for Stacey. His "Run Stace!" was his attempt at protecting her from confessing to the police.
I don't think Bradley seen a way out - either the blame was going to be put on him or the love of his life would go down for it, so he jumped, knowing full well that people would assume he must have murdered Archie and committed suicide because he felt guilty.