Would this upset you?

A girl private messaged my boyfriend that she thinks he is cute in a picture. This was 2 months ago. I read his messages and after arguing with my boyfriend about it he finally admitted that he thinks she was flirting with him but didn't realize it at the time. He still talks to her and she is always commenting on his posts and he responds back. He is always heart reacting her posts and vice versa. She lives 2 hours away and he has never met her but it upsets me that he would still associate with someone online who he even admitted was flirting with him. Would this upset you?

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