Why does my girlfriend delete her text messages?
She might be deleting them to ensure her privacy if you have been reading them. She might delete them to free up space in her phone's memory.
I wonder if she's deleting them because there is something incriminating in them.
Like criminal activities?
Or she doesn't want you to know that she's making fun of you to other people.
I hadn't thought of that. She doesn't want me to know she's talking about me behind my back.
Or to your front, though showing the back of her phone to you.
She might be cheating.
She might be deleting them because she's talking to others about how paranoid you are.
What should I consider suspicious, and what is reasonable?
If she returns from a trip and deletes her text message history and her email history, she is hiding something. Whether it is an affair or buying a lot of stuff on a secret shopping trip, that's to be determined.
What else could she be hiding?
There's a lot of hubbub about federal officials sending official messages through their personal email accounts to avoid having to turn over incriminating messages in response to Freedom of Information Act requests. Maybe she's hiding something super secret.
Maybe she's hiding something from the NSA.
Nah. They get all that from the data transfer points and internet hubs. Deleting it off her phone only hides it from you, not them.
What should I do?
It depends on her behavior. If she's lying about spending or travel, then you can be suspicious.
And what if she's always acted this way?
Maybe she's protective of her privacy.
She ought to password protect her phone if she's that sensitive.
Or you could offer to let her read your text messages and emails to reciprocate.
Let's not take it too far.