Facebook Stalker App?

[Mysterion]

My ex called me a stalker for looking at her profile every few days in the first week we broke up. I didn't know Facebook had alerts that told you who views your profile. Anyways, I Googled it and I found the stalker app, but it says it's full of viruses and is dangerous. She doesn't have a computer, but she may use her friends computer. She mostly uses her phone. Can the app be found on the phone market or what? I'm just wondering if she really knew I checked her page or if she just expected that I would be...and by the way, no I am not a stalker. So don't think I'm some crazy person. Haha. Thanks for any feedback.