Guys, do I have the right to be upset?

Before me and my boyfriend happened, he was close with a few girls and used to like this 20 yo girl. She’s 4 years younger than me and for the first few months after i moved in, he’s still in contact with her. I knew that she’s dating someone old maybe around 40 something while she’s texting other guys including my boyfriend too.

And i know it’s wrong but i read their chats and she asked for stuffs like chocolate, giant doll, even money to my boyfriend so it’s logical for me to assume that she’s a gold digger.
I brought this topic once to my boyfriend and he said ‘’No, she’s not a gold digger, she’s a pure little girl” and it upset me. Is it okay for me to be upset?
Guys, do I have the right to be upset?
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