Should I be concerned?

So my boyfriend recently opened up about having mutual feelings for a girl for almost 5 years without talking to her. He said that it started coz she glanced over at him from across the room, and he told me things like he'd hide behind a wall and just watch her from a distance each time he sees her but they never approached eachother due to cultural differences. He said it all ended 2 years ago and we just recently got into a relationship, but even though he shares public photos with me, he makes still hides them from her. He goes to the extent of coding things so that she can't view the pictures he takes with me.
Should I be concerned?
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