My boyfriend added a random girl on an online game , shared his phone number and social media accounts with her, is he wrong or am I overreacting?

Anonymous
Today when I came to know about it we started fighting. He said he don't have any "intentions" with her and that he's completely loyal to me. But he do not have an answer for whether why he added a random girl on an online game and shared with her his contact number... He said I am overreacting. What should I do? Am I overreacting or is he wrong?
My boyfriend added a random girl on an online game , shared his phone number and social media accounts with her, is he wrong or am I overreacting?
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