Back when I was playing ME1 I chose Liara. Then in ME2 I went with Tali. And then in ME3 when Tali shows up I chose to continue the relationship. However I've always wondered... What are the consequences of not continuing the relationship when you meet her in ME3? I know you can get back with Liara. but I'm more intrigued about what happens on Tali's side. I've looked around and it appears that from Liara's side she just shrug it off when she gives you the "I need to know where you stand" line. But what happens with Tali? Does she get angry? Is there anything about they that is worth mentioning given those conditions?
In regards to when you meet Tali the wiki says.
After a brief discussion with the admirals, Tali and Shepard walk into another area of the ship where Shepard can inquire about their relationship. Tali informs Shepard that she can't discuss it in front of the Admirals and suggests that he invite her to his quarters for a more private conversation. If she has been invited to Shepard's quarters, Shepard may choose to continue the relationship with her.
But that's it. I do believe that Liara's question comes before Tali even appears at all. So considering you told Liara you wanted to get back, what happens with Tali if, during the quarian diplomacy conversation, you chose not to continue the relationship with her?
P.S. This is not considering the Shadow Broker DLC for ME2, I know there's some stuff about Liara there, but I never bought it.