I often wonder "what if". Like the movie, sliding doors. What if I didn't bump into my distant cousin 17 years ago whilst catching a train for weekend leave. What if I didn't go to his university medical party that night. What if I didn't meet my W at this party etc etc etc.
Maybe our current S's are not the right ones for us. Maybe this has happened for a reason, and you will find someone amazing, and live the rest of your life in a "loving bliss".
Okay, maybe that last bit sounded a bit corny but you know what I mean.
I too am looking forward to the future. I look forward to the quality time i will spend with DD (away from W). I look forward to my freedom to pursue what I want to do. I look forward to meeting new and interesting people (not necessarily a R, but friendships etc)
We will all come out of this better people, and happier people. You may not thinks so now, but trust me, with time, you will look back on your life and say "what was I thinking". There will always be a positive outcome for you, regardless of what happens.
I hope your "D" day goes as well as expected. All my best.