A large percentage of the world population sleeps alone. There's nothing inherently wrong with that. The pain is grief over having lost your W, which is going to come and go in waves for a while.
What I wish for you, is the strength to step away from W, not allow her to play with you, and not get pulled back into her chaos every time she beckons.
You being so available is giving her the opportunity to drag this out and indulge in more self-obsessed drama. That's why she pulls away again - you fed the beast, she's content for a while and doesn't care about anyone than herself right now. Truly, truly egotistical. I hope this makes you a little angry soon, just enough to carry you through the next few weeks.
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17