Is Snapchat ruining my relationship?

My boyfriend is a little older than me. Like over 10 years older. We work great together, and I can say without hesitation he’s made me happier than I’ve ever been. However, due to the age difference, our use of apps, such as Snapchat, we have a different understanding of the meaning of sending snaps. He gets offended and thinks I don’t want him if I send my top friends a snap, but exclude him even if he was sitting right there when the snap was taken.

How do I help him to understand I don’t do this to hurt him, and everything I do is insignificant. I don’t love him any less just because he is excluded from certain things...