How come my boyfriends brother didn’t respond or aknowledge me?

My bfs brothers wife gave birth to a child today and I msged his older brother saying congratulations but he didn’t respond to me and only read the message…. he used to always message me before asking what me and his younger bro were up to and if we wanted to come out with him and his wife…or if there was an occasion where he expects gifts for his kids….. now he’s being rude to me…. how come?
he’s also rude and nasty to his younger brother at times and also has a wife who’s a bit on the possessive/ bossy side of things…

He’s jealous of me and his brother
Doesn’t like me anymore
Other/ his wife doesn’t want him messaging me
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How come my boyfriends brother didn’t respond or aknowledge me?
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