@SirReapalot: I know it's 7 years later but I'm playing now and I have the same problem. I was originally with Miranda in ME2 so I worked on the trick where you quietly break up with her to change course of events plus romance someone else but key options never showed up with Liara when they should have. Starting to think I confused the game pursuing both. I didn't even have the key options with Miranda on the 3rd visit to lock her in even if I wanted to so I know the trick worked (among other reasons). So yeah, you're not alone. :-(
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