Welcome to modern life. If you are not smart enough to keep your secrets encrypted or password protect you text messages, then you should not be sending or receiving risky messages. Relations are complicated arrangements. Often they work because of some side thing that brings some zest
to an otherwise familiar and often routine existence. You can't be everything all the time to another person. To try is futile. As a rule I don't go into my other half's email or private messages even if I can, and surely I could break in if I wanted. What happens during a business trip is not my business if it does not threaten me. I also expect things to be handled intelligently and all traces to be removed from my view. I promise to do the same.
My advise for people who use the android platform is to consider some of these apps.
Handcent SMS:
"Additional security options allow you to password protect and hide individual messages with the Privacy Box or secure all of your messages. These protections apply regardless if they are viewed in Handcent SMS, the stock Android messaging app, or any third party applications!"
Or you might try to password protect applications by using:
Smart App Protector(app lock)
"Smart App Protector will protect your installed applications using a password or pattern!"
This will prevent unwanted parties from accessing your email application.
Or you might consider: Secret Box-Hide Picture & SMS
"Secret Box hides your pictures, call logs, messages and videos from prying eyes for FREE. Keep your private information safe and hide pictures, videos, contacts and call logs quickly and easily. Secret Box is so well hidden; people won’t even know it’s there!"