Oh yes, it's very hard to act "as if", I don't think you will find one person on here who will say ..."oh no! It' a breeze!" LOL.
What I find helpful is this....really look for those small signs that your spouse does still love you. What are those things that say she's still in this R? They may be very hard signs to see...but for example...your W didn't say..."whatever you want" when you asked about the weekend, she did say she would think about it. I mean...she could have looked at you and said "Are you kidding?!"
I guarantee you, there are signs there....you just have to learn to recognize them. Is she an "Acts of Service" type of a gal....does she do things that may seem mundane for you, those could be subtle signs you are missing.
Now, when you see something like that hang on to it, recognize it for a sign of life in your M and use it to boost you to keep on keepin on.
