I have my theory on this:
I think that TC has a few things in the shed:
a) memories of his tennis career
b) memories of his relationship with his father
c) memories of some woman he loved before Eve

I'm getting the feeling more and more that there is some shrine to a woman in the shed.

As much as TC has put Eve on a pedastal, she's put him one too. So much of Eve is wrapped up in trying to be a good enough wife for TC.

I think she would be devastated if he has something in there to another woman.

And, I also think that this other woman was involved with Julian.

Remember, when Sam and TC had their talk a little while ago, TC admitted that it was something MORE than the accident. Well, Sam knows about the accident AND TC's father's death...but, there is MORE.

The only other 'MORE' that I can think of, is a woman. A woman that he loved. A woman who betrayed him with Julian, which is why he demands 'PERFECTION' from Eve.

I think Eve will feel deeply betrayed by TC worshipping some other woman all throughout their marriage. I think she will be hurting, and, in a fit of pure rage and illogic, she will want to HURT TC as badly as he's hurt her.

The only place where she can hurt TC like that is with JULIAN.

So, yes, I do see her returning to Julian's bed.

But, ONLY if some catastrophe happens that either:
a) reveals her past, and TC throws her out, or
b) something happens to totally shake her belief in TC