Newbie- Very Lost- Not Sure where to start

[tdb68]

I am observing my W, and trying not to say anything to her about her actions. I have noticed very recently, as I am "pulling away", she becomes paranoid and protective. She is taking her laptop whenever she leaves the house, locked her phone, and even locks her car in our garage (none of these she would have done before). When I discovered her EA back in 2009, and when she walked away, i was "snooping" trying to figure out what the heck was going on. When i reassured her a few days ago, that i was not doing this, whatever she is doing is on her, i learned last time around, all is does is give me anxiety, and I can't change what she is doing anyway.. So, as soon as I pull back (I didn't call or text her from work this morning at all), she starts to "freak out" and start hiding things again, just happened when I went home for lunch. Do I continue to re-assure her? If she doesn't have anything to hide, why the secrecy? Could I be dealing with a MLC here? or another affair? Anyone else seen this type of behavior?