He posted story wishing someone birthday at midnight

I don't know what to say or feel about this....

I don't know anything about this friend... Not from college or school.... He said he met her on PUBG.... Then they found that she is from his maternal hometown....just this much

I wouldn't be upset if he wished her ... But how he did it.... He posted a photo collage of her on his public story at midnight....

He had never done it for any other male or female friends..and not even me ...

Do boyfriends not know boundaries?