Belgium short stay visa rejected

Hi All,
I’d applied short stay family visit visa for Belgium from UAE, as I’m employed here in an digital agency and working as a computer engineer.
My sister and her family lives in Belgium and they recently got Belgiun passport as well, so my brother in law sent me invitation letter.

Visa submitted: 28 Jan 2019
Visa sent to immigration: 6 February 2019
Visa rejected: 09 April 2019.

I’ve not got the refusal letter yet, just saw it on dofi website. It’s one of the most sad day of my life as I was not expecting the refusal.

My intended date of visit was 5th to 14th April, can it be the reason as the date was passed when they took the decision?

Plz guide me.
Thanks

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