My Gf found some pictures of me on Fb and she is PISSED. Is it really my fault?

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We met 3 months ago and the first thing she wanted to know was if I had FB. I made one 2 years ago with one picture on it and maybe 130 friends. But I hadn't been online for over a year. I said I didn't have it. I really didn't think much more of it.

But then 4 days ago she wants to show me something. She shows me my Fb page and it's full of pictures that people had posted. There were a few with me and my ex Gf cuddling and hugging. There was one with me making out with a girl from my friends circle. A girl that she has befriended. Anyways you get the point.

All of this was before her. But she got really mad and stormed out. I've tried contacting her for 4 days now with no success. She is mad because I "lied". But I really didn't mean to. I don't even remember my password for the damn site.. And the pictures had nothing to do with her. What the hell do I do now? Crawl and beg for forgiveness?