MM, I think your boys like mine are looking for reassurance that things are going to be okay. My S6 pestered H a lot about wanting us to be a family again, why he left, when he is coming home. I would tell him that Daddy just needs to work on some things right now and he can't do it here. That was good enough for S6 and he stopped asking. I think your wife handled it well too, just saying she needed some girl space. I think it's important for the kids to realize that this is not their fault, because they tend to take it as such. It's very difficult on my boys because their father was very involved pre BD.
I think you should still respond to your boys with assurance. You don't have to say she is beautiful if she is there and that comes across as pursuing. You can say, "You're right, buddy" or "Yup and I think you look super handsome!"
M38,H39 M:16Y BD:8/12 OWDB:11/12 S:11/12-5/13 "Temp" home:6/13 OW dropped:9/13 "I love you":12/13 H ring on:2/14 Depression back:5/15 "I'm done:" 7/15 H moved out: 3/16 H moved back: 12/16 Working on us: 3/17