-N7-Seeker wrote...
Tali is simply grown up. In ME1 the whole galaxy was new to her. But in ME2 it wasn't anymore. Yet she is only showing her strong and confident mask to the ppl who do not know her. She talks openly to Shepard. She states that she doesn't like to be an Admiral, but she has to be one. Their romance is the only thing that can distract her,. She joins Shepard in ME3 because she doesn't have to worry about Rannoch that much again, and of course, their love.
<note this is based on my Shep>
Not just distract, but support her. Ever since she came to the Normandy there's only been one person who just accepted her for who she was and was supportive of her.
In ME1 she learns something amazing and important. The only one who listens to her, accepts her and doesn't try and use and/or kill her is Shepard. Not only that but he takes her in and make her an equal part of the crew. And then you talk to her, engage her and show an interest in what she has to say. At this point she is starting to fall for you but her own insecurities, the fact she is in that suit and is to some degree "hidden" and the presence of a strong human female and a beautiful, smart asari makes her fade into the background in her mind. And yet even with them this man still show interest in what she says and even helps her find the one thing that makes her pilgrimage a resounding success.
Fast forward two years to ME2. She's grown up more, but in part lives by a mix of her own sense of responsiblity, a desire to please her father, and by the memory of the human commander who meant so much to her. Seeing him brought a lot of things back to her and even though she regretted it she did not join you at first. Why? Because of the needs of her father and her people. And then you meet again on what is arguably a ridiculously dangerous mission. But once she had the chance to rejoin she did. And then what happens? She sees her father die and is accused of treason. For a quarian, especially her, that is the worst thing to ever be accused of. And then the same man defends her, comforts her, and respects her wishes regarding her father's legacy. And while doing all that he gets the charges dropped. In doing that he does the one thing no other person has ever done, speaks to others about who she is and her strength and her value as a person. I think it was at this point that she was past the point of no return regarding falling in love. And then you have the romance proceed apace.
In ME3 she returns not as just a crew member but as a full Admiral that is very much Shepards equal where things count. All of the original crew has "gorwn up" and is now the ones making the decisions. She is competent, and leading her people and an equal admiral. And it weighs on her being respsonsible for so much. And she did it as much for you as her people. So she looks to the only man that accepts and can understand her. And in turn she supports him as strongly. She decides to not stay on Rannoch for multiple reasons. Rannoch, as important as it is, represents a lot of pain as well for her. She needs time to heal from what it meant to find it. Between the loss of friends, her father, and Legion who sacrificed himself so his people could be free (I picked peace) and gain true awareness. Then there is the man she loves who she wants to be with, she spent her whole life to that point living for other peoples needs and she realizes she cannot only do that anymore I think. And hell with the Reapers having a good chance to wipe out everything like they do this might be her only chance to have the love she wants with the man she wants.
A lot of the game she is working under her fathers shadow, trying to do what he would want and not her. I think on Rannoch she finally realized she couldn't do that anymore. The whole arc of her character from ME1 through 3 is about a young woman who fully matures and becomes not the Admiral's daughter but the Admiral.