*without the tiniest mockery*
Oh, anyways, to add something. If this "has to be in ME3" thing comes true, note that it stands for other LIs too. Just for the record. If one gets in the others shall get in too. Seriously.
And if I can make a suggestion, make a friendship line with her too. The majority of people out there (not the participants here, of course) chose another romance interest. Well, the majority doesn't even pursue cross-species relationships. And we, who don't see her as a bed-warmer, would like to see something other than that. Frankly, if you choose not to sleep with her, you get nothing more. In ME1, if you turned down a romance, you could still build up a -friendly- relationship with the love interests. That was missing from the second game in case of all LIs. Once you say "I don't feel this way", they basically tell you "I don't have time, I'm in the middle of something". Which is an obvious step back from the second game.
As I said, Tali is a girl, not a women (which is absolutely okay, that was the point for her targeted romance audience), so my Shepard is more of a mentor to her, but we are lacking the option to act like one. Or a friend. Or anything else. There is no other relationship-development than sex. That bugs me about all the love interests in the game.