mranderson25 wrote...
Anytime i try for a playthrough where i romance a different LI, i always end up flirting or giving in altogether with Miranda lol.
I know the feeling

I've tried several times to play a game where Shepard stays with Ashley and doesn't romance anyone else, but it never works.
I'm hoping her resignation at the end of ME2 was enough to keep her wholly dedicated to Shepard and his cause, i can't imagine what else she'd be doing otherwise? Don't think she'd be too keen on joining the Alliance, and i don't see her becoming some type of mercenary or anything like that, so she'd have to stick by Shep's side?
Actually, Miranda has her own cause. It's Cerberus' official line of "advancement and protection of humanity". If she breaks with Cerberus, it can have different reasons, and one of them is that she thinks Cerberus doesn't embody that cause anymore, but there is no indication that she's gone back on it herself. She'll be with Shepard because their goals are compatible, not because she'll follow his whatever happens. And I certainly hope that should Shepard sacrifice humanity for the rest of the galaxy, she'll not follow him.