Dear One, Sometimes life seems hopeless in this stage of grief. It is not that different in the beginning as a loss through death, except we have one major factor which is hope. In this case I think you may be placing it in the wrong direction. You may even come together again, but I feel it being short-lived. Don't ever forget about what you had.
Beautiful memories can sustain life like water.
I do recommend that you point your hope toward the direction that many more beautiful memories can still be created with another. Dear Astral, I feel lost and alone. I feel I have no purpose in life anymore. I feel my husband has found someone else for me being so distant and depressed. I don't have any outlook to look forward to.