Why doesn't he like any of my photos?

There is this guy I have been talking too for a bit now. He has told me he likes me almost about 5 times now. We hang out and are getting to know each other. One thing I can't seem to understand and this may sound silly. But he is big into istagram. He will comment on my stories but I notice he will not like any of my pictures that I post? I find it odd since I know he is on a lot. We aren't exclusive or anything. I have met his family and we are planning a trip in a few months. I am just curious since I see him like other girls photos all the time. What do you think of this behavior?
Why doesn't he like any of my photos?
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