Why is my ex bragging about his life?

So my ex boyfriend messages me just to tell me he has been having so much fun lately, that he got drunk and chilled with a bunch of girls. He even gives me detail wich I don't get at all... he also braggs about how he is so happy he is single and its the best. Like really I try very hard to have as much fun as I can, and I really don't care about what he does anymore but why does he have to rub it up on my face? I gotta admit it makes me feel bad a bit and also jelous... Anyways what do you guys and girls think?
Why is my ex bragging about his life?
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