Charming Deception by Carol Ann Kauffman

Samantha wakes up to a perfect life, with a handsome, attentive husband she doesn't remember. She has it all: a luxury vehicle, designer clothes, beautiful jewelry, and a condo on the beach. 

But this isn't the life she remembers. 

As time go by, Samantha discovers she is the object of an elaborate deception, one large enough to include, other worlds, body doubles, time travel, world-hopping, and a galaxy guardian as cold as ice. 

Is her charming husband in on this deception?

Imagine, if you will, that there are other worlds parallel to 
our world. Different dimensions, actually, of our same world. 
Now, imagine there is a doorway or a portal between these worlds. The inside of a wardrobe. The back of the closet. A mirror, maybe.

And imagine you stumbled through that doorway...