I think the whole "dating thing" is a personal decision for you. If it feels okay to you and you can separate casual dating from entering into a R then I think it would be okay.
For me I know I would not be able to do this easily, so I am choosing NOT to date while we are separated. If H files for D'ed I may change my mind at that point.
I am on a the same page as you... a break-up had to happen to give our M a chance. BUT, my H is still deeply "in love" w OW. SO, I don't know if there is still a chance AND I'm not so sure any more if I want to R.
This journey certainly is interesting! Good luck w moving forward. BTW forward is the best place to go. Stalemate sux.
M- 18 T-21 S-14,11 & 10 BD 6-18-2012 (OW-EA) H moved out 11-3-2012 10-5-13 Me- I want a divorce. I want to move on w my life. 11-25-13 Jointly filed.