Sweets Book - and it's importance in the 100th

i think they date other people because they have self revelations where booth realises he loved bones al along, and bones realise that what she feels for booth is love. i think that they then get a little to close when they are "married" in death of the queen bee. i also think that episode will be major dejavu from the coma/dream, this will then cause them to run from each other because they are afraid of falling for someone who who in their opinion doesn't or cant love them back. The thought literally "losing to much self control", and loving someone who they cant be with scares them enough to date other people.