This guy is really sending odd signals?

So, I have a photography Instagram page, and one of my guy “friends” followed me on it. I rarely post my face, and mainly focus on nature shots, but whenever I do, he always likes those photos, and hardly ever likes my nature shots—if ever. It’s weird because I know he’s very online, and sees all of my posts; what could this mean. Also, whenever I would see him in the hallways, I would wave, and he would always act so “nonchalant” about it, but then I find out that he asked my sister about me at an event I wasn’t at (?) additionally, he used to walk with his (now ex) girlfriend in the hallways, and WHENEVER I would pass by, he would first look down, then fix his clothes, hair, whatever—and it was really uncomfortable. To top it all off, he “friends” with so many girls in the school, and I was randomly on IG, and found he liked some girls bikini pictures, and it’s like DUDE, get away from me. I don’t want to fight with a guy over his following.

This guy is really sending odd signals?
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