An app to keep private pictures private on the iPhone 5?

SO. Gonna be honest, I have some pictures on my phone that were sent to me by my significant other and are for my eyes only, ya know? However, there's no way to take these photos out of my general photo stream/camera roll on an iPhone 5. I can copy them into an album, but there's no way for me to remove them from the camera roll. And besides that, they are not exactly extra secure in the album anyway. I like to show people pictures on my phone without being worried I'm gonna show them the wrong pics, and it is very important to me to keep these things separate and private. And also I'd like to keep it on my phone. It is also not preferable to have it accessible online anywhere.

ANYWAY, is there an app where I can keep my photos separate from the camera roll on my phone, preferably with a pass code lock? A good app would be much appreciated.

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