The Key to avoiding emotional separation, is to make Limbo phase short.

It starts with Separated Under the Same Roof.  
So how do you Survive The limbo phase?

You've decided to split but you're still living together. You're no longer a couple, but you're not yet totally  independent. Here's are three of statuses of the Limbo Phase:"

 #1

"At first she  didn't want him to leave; she thought he might change his mind about the divorce. But he's sleeping in the guest room, and it hurts so much she  can't stand it. One night she yelled at him for being late for dinner. That doesn't even make sense!"

"Why did I yell at him it did even phase him!"

This is that transition phase, where old habits require a conscious effect to avoid doing what you have been doing for years. When two people have been together for years you develop habits, some good some bad... these habits are what need to be rewritten. Not easy to do... You resist mostly because you are not ready to make a full change, the more you continue to do the things that you the other person appreciates you will stay in a rut mentally .i.e. dinner on the table as soon as he arrives home from a long day. etc...  

 #2

"House for Sale.. couple splitting up, must sell ASAP!"

"We don't know long how long it'll take to sell our house. Until we have answers, we don't want to tell the kids we're splitting up. So we're acting like nothing's changed, but really there's an invisible piano suspended over our heads."
Your dream home now has to go on the market for Sale. It will soon become another couples dream home... they will make changes..to the  home  that you both wanted, now it will become the home that another couple will enjoy, maybe even raise their kids there. Your kids will just have their memories of what was... and you and your ex will no longer spend holidays together with family.  

 #3

"I can't stand the sight of him. If he doesn't move out soon, well... all I can say is it's good we don't own a gun."

I have  to get out of here!

"It's a thin line between Love and Hate!"

It's 5 o'clock in the evening
You're just getting home, You knock on the door
A voice, sweet and low, says, "Who is it, why didn't you use your key?"
She opened  the door and lets you in
Never once does she even look at your face or say, "Where have you been?"
She just says, "Are you hungry,  did you eat yet?"

Just keep remembering "It's a thin line between love and hate", maybe you should call out for a take out meal to be delivered, to be on the safe side. 
Don't think you can keep breaking your woman's heart, and she'll sit back and enjoy it. She going to fool you one day! 
The sweetest woman in the world, could become  the meanest woman in the world, if you make her that way. You keep hurting her, she keeps being quiet. She might be holding something inside that will really, really hurt you one day!

Let me state in my BAD opinion: The Key to avoiding continuous emotional separation under the same roof , is to make 
the  Limbo phase as short as possible  if not shorter!

Remembering and rehashing the feelings you once felt will keep you trapped, you need to let it go!

 On Your Own