Words in any shape nor form will convince W to come back. Plus convincing her should not be the aim. The aim is she will want to come back. That is an internal process that she has to complete.

You can influence that but not directly:
# let her go. She cannot come back until you have let her go. Pretending or playing dim/dark won't work.
# there is still a void in your life. The trick is not to fill that void, but to expand all other aspects of your life so that void is imperceptible. IMO it is healthy to have a void there because a R with someone special is important. However dwelling on it will not help.

I wish you luck with this and with the flat hunting


R 25 years
M 14 years
S11 & S13
Working on it alone since Oct 2014
M in trouble a lot earlier (~2 years)
Feb 2016. 1st R chat in a yr.
Next R chat Aug'17
Still together