I think weddings and marriages are between the two people involved and there is no obligation to tell anyone or invite anyone.
I know that sounds harsh and I can understand that you're hurt but I think maybe your BIL was thinking that it was early days in re-mending old wounds with your DH (given the short amount of time between Xmas and April) and maybe they didn't want to risk any blow-ups at the wedding. I think your SIL then probably thought, after getting to know you a bit, that you're lovely and she felt a little embarrassed telling you after the fact!
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