Hacked a gfs facebook?

So I figured my gf was hiding something and hacked her facebook... turns out i was right. she planned on hooking up with someone 2 months into our relationship. I lied and said I had friends who ask around and found all this info. She thought she had deleted her facebook but deactivated instead and didnt realize. But she did think I hacked her facebook. But then this morning, when I myself was on facebook, i saw her on my friends list and saw her there. She hasnt confronted me about it yet... and idk what to do.