Finaly a glimmer of hope for the peace you deserve. The setting provides great emphasis in three ways. A beach is a place of boundaries: you have been trapped by the perception that you are subject to unreal boundaries in your past. The sea, in the aspect of waves and tides represents the cycles of life, in this case the development of a different relationship created in the time of the poem. Finally, the sea itself is a symbol of change, under scoring the profound change you are finding available to you.
Beautiful poem, Saffie.

Amazingly beautiful.