Why does my boyfriend never like my profile picture on facebook?

So every time I change my Facebook profile picture, which isn’t all that often, he never makes the effort to like it.

I know he’s on Facebook regularly enough to see the changes. It’s not like he’s active on FB, and he only ever likes a post that is directly related to him usually. But, I feel as his girlfriend he should at least like my picture. It’s not like our relationship status is displayed on there either, although close friends know we’re an item. I just think it would be a nice public acknowledgement if he liked my profile picture.

Why does my boyfriend never like my profile picture on facebook?
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