Only you know what you want. Ask yourself a few questions.

Can you love someone who aborted a baby and left the father to come back to you?

Can you love someone who is having someone else's baby?

Can you forgive yourself the hurt you would place on your new GF if you left to go back to your W?

Has your W made any changes to better herself like you did?

Can you see a long future with your GF?

There are many more but just think about these for a while.

Me: 39
W: 44
SS 24
SD: 20
M: 13
T: 15
Bomb: 2/16/11
EA: 2/14/11
Papers Signed 4/13/11
Divorced 5/13/11