LE - people will have different opinions re when it's ight to start other, date others or start a new R and each to their own. You know where I'm at bruv. However, I would suggest that you think whether you being done now is partly due to the OW you are talking too ? Think about it hard and if you are done as you want to be able to look back and realise you gave it your all. I sense your W is not 100% gone herself, just in the middle of some real bad heavy fog.
Keep being the great dad you obviously are and always remain the caring H as much as you can. Others go towards hate almost and I hope not to. I've not yet, but my mediation hasn't started and that's when it could get like that I guess.