I found texts :(

Not a really big deal but I'm still hurt.

Even before my bf and I were official we were really close. Today I found texts between him and one of his ex's from 2 days before we were official. They're all calling each other "boo" (something him and I don't do) and sending kiss faces.

He's told me they talk a little regularly but it's all on snap chat so I can't check to see what they're talking about.

What should I do? Idek if I should b upset??