Bravo! I think you just set a very healthy boundary. If he still wants to see other women, he should man up and get a divorce, end of discussion. You gave him a nice opportunity to see what life might be if he came back - NOW he needs to see what life might be like without you.
If you back down, he'll think you don't mean it, and that he can continue with the cake-eating.
So pack up his things, have them waiting for him when he gets home, let him go stay at a friend's or the OW's or whatever. THAT'S not your problem.
And yes it [censored] that the kids will see him leave again, but know this - even if you reconciled today, the kids may always be waiting for the other shoe to drop. My kids were teens when my H and I went through his affair and reconciled. He never even left the house. But now, many years later, we are divorced and my kids are in their 20's - and it turns out that during those happy post-reconciliation years, THEY were always waiting for the other shoe to fall.
