How to find and remove spy software on phone My girlfriend has an admirer which started out as a good friend. He confessed his love for her some time ago and started to become more and more aggressive while being rejected. He recently started to show some stalker like behavior and started to appear near her flat at late nighttime.

He also hinted, that he always knew when she was chatting with me through WhatsApp. I'm therefore afraid that he might have installed some Spyware on her Android-Phone (HTC One X+)

Is there a way to identify Whatsapp Spyware and to remove it?
Format the sd card and flash the stock rom again. This would guarantee clearing out any spyware. Here is a tutorial describing how to take it back to stock. 

"…I say we take off and nuke the entire site from orbit. It’s the only way to be sure."