Why is he more happier around his friends?

My boyfriend appears to me more happier around his friend than he is with me. When we are together he is happy but not as happy when he is with his friends. He’s gotten some new friends recently and has been around them a lot. So far he’s introduced them to me and ever since he’s just been in a super good mood that when someone ask him about how he’s been he is smiling saying he’s “great”, “wonderful” “amazing.”

Why is he more happier around his friends?
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