Why did my ex send me this message after I have a new boyfriend?

I just have a new boyfriend and once he knew he sent me a message on facebook saying that Congratulations he is happy for me and he has to say it hurts more than he thought. Previously I tried so hard to get back with him and he didn't want to. I don't know what he is trying to do.
Why did my ex send me this message after I have a new boyfriend?
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