Not trying to speculate on the thing, so I'll use a me based narrative
My wife has moved out into a house she has bought, she barely speaks to me, she is in love with another man (though that relationship is not going well last I knew), she has surrounded herself with poison and describes me as 'controlling abusive and mean'. Her actions have humiliated me and saddled us with a combined extra £200,000 of debt. She is yet to take a shred of responsibility for our marriage failing and equally has yet to openly say anything that passes for sadness over what has happened.
And yet strangely none of that is a deal breaker for me, yet 6 months ago if you'd asked all of it would have been.
But also none of that matters because the deal breaker in truth is she doesn't want a relationship with me (coparent only because she has to and I make a good babysitter).
Like you I fear being sat alone pining after someone who has entirely moved on, which let's be honest in my situation she most definitely has. (Yours feels different to many of the situations round here and I think thats a credit to you)
BUT
I couldn't date yet (thought about it a lot) as I wouldn't be being fair to whoever I dated. I need to heal, grow and live my life in the best way I can. Keeping a door open and a candle lit for the hope of reconciliation doesn't actually change what I need to do for myself. And so I need to keep on trying improve mk8/9/whatever and then at some point IF the chance arises I need to decide if there has been too much for me to take.
What I'm trying to say is your doing good, just keep swimming
Both mid 30s, 2 young kids BD 7sep14 XW moved on long ago, now living with OM1 D paperwork in progress