A few months ago there were rumors that Rob Kardashian and Blac Chyna were on the outs [click here if you missed that].
Turns out the rumors were true...
Apparently last night when Rob flipped out about Blac Chyna being excluded from his baby shower [click here if you missed that] it was because he had no idea his sisters had been planning a separate shower for Chyna, with her approval, because of the break-up.
Sources close to the Kardashians Rob got pissed at his sisters Monday -- especially Kylie -- for what he considered a slap in the face ... the Chyna-free shower they were throwing. We're told the sisters only planned separate his and hers showers because Rob and Chyna haven't been speaking for months.
They briefly reunited for a dinner the night before their reality show premiered, but other than that ... they've been split.
Still, Rob was pissed when he learned BC wouldn't be at the shower -- so he skipped it.
Thing is ... we're told Chyna had agreed separate showers were best.
Rob wasn't told that until after the fact, and we're told he's still pissed.