Gf tried to catch me cheating...thoughts?

[C]

I've been with my gf for a little over 7 months. Recently she created a fake facebook page and tried to add me on it. The profile picture was some girl with her t*ts hanging out, and she had zero friends. Shortly after trying to add me, she immediately messaged me, being extremely flirty and trying to get me to meet up with her. I'm not an idiot. I realized right away that it was my gf. She denied it at first but eventually came clean.

I'm kinda annoyed with her and I think it was pathetic of her to do that. She's telling me she only did it because she's been cheated on in the past and has trust issues. I could maybe understand if she did it at the BEGINNING of our relationship, just to see if I was for real, but 7 months into it seems kinda messed up.

Would u be pissed too or am I overreacting?
Nah, I haven't done anything to make her think I'm dishonest or anything, and even if I unknowingly did something to get her panties in a bunch, I still think it was lame to do what she did rather than talk to me about it.