Have had no chances to interact romantically w/ Omar on the Omar route?
Viewing post in Remnants Of The Past - Act 2 comments
Once you're in someone's route you'll get romantic moments with them no matter what (though a few choices in Ada/Omar's route depend on whether you slept with them or not at the end of Act 1).
If the data didn't import successfully like you told me in your other comment, maybe that's why. Sorry for the issue!