Anyone knows a facebook app like that?

[?]

Seriously! Do you know the meaning of password? why don't you stay logged in and monitor her facebook in a different computer?

By the way IF someone is caring and loyal it doesn't matter what you think about that person. And IF that person is not unfaithful, you cannot do anything about it! Your relation will be over.

Important question, have you shared your password with her? or can you dare to do so without deleting your messages and history? Cause the things we think about other people are often reflection of ourselves.

Whatever it is, directly talk it out to her with patience and understanding. Hope your relationship works out.

Best of luck