Do I congratulate my ex on a new baby?

My ex husband just made an announcement on social media that him and his new wife had a baby.

We don’t really talk anymore socially.
We don’t hang out either.
Do I congratulate him on social media?

I feel if I don’t people will say I’m bitter.
If I do people will realize I’m still around and feel sorry for me.
Im currently single.
Yes
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No
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Do I congratulate my ex on a new baby?
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