Vise, you're clinging to the possibility of her comming back way too much. Stay off her phone, stay off her iPad, stay off her Facebook, stop questioning why she's nice to you, stop questioning why she's not at the neighbors, stop justifying there being no other men because you can't see them. I've been down that path countless times and none of it really tells you what's happening. None of it matters, she wants a separation and then she will want a divorce.
I know she's been such a big part of your life and how difficult this is for you but you have to find yourself through all of this. Not her, not another woman that will make you happy, you. Stop snooping, it's not helping you and once you separate homes it could cause you to make some stupid decisions.
Accept what is, let go of what was, and have faith in what will be