Social Media, am I overreacting?

[GirlsDeadMonster]

I know you shouldn't put too much emphasis on social media but there are little things about his that bother me. We've been together for 10 years, we live together, no children, and plan on getting married someday. Of course we love each other but he doesn't seem to reference me in his online life at all. We both have facebook and instagram accounts and post the normal, what we do, who we're with, pictures of friends and families. But on his page there are no pictures of me, no references about me, no "hanging out with my girl" post, no comments at all. If someone were to look at his accounts they wouldn't know he has a girlfriend. On his Instagram he has pictures of his friends and stuff he's into but no pictures of me. If I'm suppose to be such a big part of his life, why is it there is absolutely nothing about me there? I feel like I'm overreacting and I have said something to him about it before because it was bothering me. He said he understood what I meant but nothing has changed. So am I overreacting and this new digital world should not mean so much to me? Or are my feelings valid?