Sebastian romance in the epilogue?

minor spoilers warning

I was wondering if Varric not mentioning Sebastian running away with Hawke at the end if you completed the romance is a bug? Cause I've heard from some places that he's not even a real romance, but in Legacy it's said that Hawke and Sebastian are actually married if you finish the romance. So does Hawke not run away with her husband or is it just a bug that it's not mentioned at all?