Why did My boyfriend congratulate his ex on her pregnancy?

Anonymous
My boyfriend congratulated his ex ( they dated 6 years ago) on her pregnancy. Im not happy about it. Him and his ex dont have a relationship at all. After the break up she moved on with her life. She didn't even acknowledge my bfs congratulations.

I dont see the point of him congratulating her when she wants nothing to do with him. She didn't even say thank you or respond.

He said on facebook" Im so proud of you I know you'll be a great mom" . *Crickets* She liked and responded to everyone but him. lol
Why did My boyfriend congratulate his ex on her pregnancy?
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