So I posted about this girl a few days ago. There was some good, simple advice. Following that, I'm trying to get to a place where I don't care about her pursuing other men.
But I admit, its trying. Recently, she was asked out by another guy who I happen to know as an acquaintance. He's pretty smooth, and probably studies some of this stuff. What would be a good way to blow him out? She's read me a few texts he's sent without my prompting, so I know it's a test, but I think her interest is still somewhat genuine. Obviously, this will happen a lot as I continue to get involved with her (and other girls of this caliber), so I'd like to set myself up well long term.
Any strategies/advice beyond not caring whether she does see this guy?

Go back and re-read the responses the guys gave you in your thread:
how-to-deal-with-jealousy-tests-from-sl ... ml#p889052

You don't want to try to blow the guy out.

Key word: Indifference.

You aren't seeing this girl exclusively so she is free to do what she pleases (actually she is in any event even if you were married but you get my point).

On the other hand, if you make things exclusive then no she should of course ideally not be entertaining having sex with her professor or going on dates with other dudes.

She may be testing the boundaries of the relationship. If you have a "do whatever you want" attitude, she will in fact keep things casual between the two of you. On the other hand, you stated you have 'fallen' for her and you have been having sex with her for 2 months so this may be a good time to turn this in to a relationship if you want one with her. Do it independently of her jealous-inducing shit tests though.

Thanks- I did just review that, and it's great advice. But what's disconcerting is that we are exclusive.
The good news is that she calls me and texts me every day. I don't prompt her. She likes spending time with me, and always initiates contact. The sex is very good.
With that said, try as I might, I'm feeling extremely jealous of this guy. I can't seem to let it go. Partly, I think, because I believe there is genuine friction between them, and the relationship is so new for her and I.
On the one hand I want to play the indifference card. On the other, I struggle to feel natural around her when I have such intense feelings.
I let her know I'm interested, we talk about longer term plans (ex travel over the summer), but maybe she needs more security from me? I feel like she knows jealousy is an issue for me (especially with this guy- long story, I fucked up), but won't let it go.

Harsh truth: you're extremely insecure. I don't know if this girl is testing you, trying to be honest or whatever because the version of events is coming from someone who is insanely jealous. You have inner game issues that should have been handled before getting into a relationship. If your girl is texting some guy that asked her out and she knows you have a history with, she's shit. I actually don't have any advice because you're both acting fucked up.

Then I agree with Neo: Your girl should not be texting with a dude who asked her out who you have a history with and then also rubbing it in your face.