*Edit* Is it weird that my bf has never...

I've been with my boyfriend for a year now and I know I know I know social media is not what makes a relationship but is it weird that he regularly uses Facebook and Instagram but has never posted anything about me or a picture of us... about 6 months in I found out he had been using social media to talk to other girls, I figured he never posted anything because he didn't want it to look like he was in a relationship so he could continue to talk to girls. We've been together a year and if you were to look at his social media you would legit not have a single clue he's been in a relationship for a year. He has even untagged himself out of my pictures I've posted of us on my Facebook. I just think that's weird and we've actually been doing really good but I just can't help but think he still hasn't posted anything about us because he doesn't want want it to look like he has a girlfriend. Am I just being crazy? He's very open with me about his social media now because I don't necessarily trust him when it comes to that because of what he was doing earlier in our relationship but it's still hard. What do you ladies think about this?
Edit*
I didn't leave him because he was just talking to them on social media and we had a loooong talk and we moved passed it. It's just been a while since then and find it weird he still hasn't made it known that he's taken. 
Thank you Marie, I think I'll have a talk with him. When we're in public he shows me off hard core!! But online is a different story...