I'm not open to many people anymore. I've learned plenty of painful lessons from opening up to people who don't truly care. So, if I like you enough to show you the real me, I hope you appreciate it & I don't have to regret it.
Loyalty in friends is so hard to come by, but at least it helps you weed out the bad ones. The few friends I do have I'd trust with my life and that's worth the pain of finding out someone you thought was your friend never was.