Hi, I have a problem and I wonder what you can suggest. I used to teach high school girls a while ago, I have some frustration in my marriage, but nothing out of normal, and I love my wife a lot. But there was a girl in school who I got a crush on, and I regularly fantasize about her, especially when my wife is ossur or I am under some other stress. I would like to 'get her out of my head', but I don't know how to. Can you suggest anything? FYI, I used to have a big issue with internet pron, but I don't have that now. I did notice that when I was into internet porn, this wasn't an issue, but since I have been clean from porn, this is an issue! 
Can anyone offer any advice?

Welcome Patrick,
Are you able to unfrustrate(if that's a word) your marriage?
Do you currently have any contact with this girl?
Maybe when your wife is assur take that time to reconnect with her emotionally and spiritually...
-360gye

I try to unfrustrate my marriage as much as possible, but there are one or two bugbears that just won't go away. 
I have no contact with this girl, but she lives somewhere in town and from time to time I pass her by, not very often. I did pass her a few days ago, so it brought the whole thing back!
Good advice about connecting emotionally when my wife is ossur, I will try and invest in that - Thanks

Welcome
Hope you ok with me changing the title - it's a little triggering

You can change it any time

KOR

Keep
On
Rocking
! 

Welcome.  Try to humanize her in some way.  It sounds like you are worshipping her.  Imagine her with the flu throwing up.  Imagine her losing her temper and acting like a fool.

The best is to get involved with other things and not think about her at all.

Not easy, but doable.

There is a woman in my wife's family that is one of these got it all type of people that I've thought about- won't say fantasized but certainly idealized a lot- pretty, classy, nice- and then my wife hired her to do some work for my organization Innoway though that of course I wouldn't have what to do with her. Let me tell you – now that she's done some work for us I see that she can't communicate, that she spoiled, she's not so smart, and boy has it burst the bubble a lot. Not completely but by 75%

That's a nice, clean percentage, WG!

Your Nisayon sounds so difficult, Patrick... Like my worst nightmare, high school girls. Especially the way society has "sexified" them...

I don't know what to say. An experience in my world that is somewhat similar is this girl where I work. She's not even Jewish, but 21. And very attractive. And we work in the same office. It's very difficult but when she stands around me, I try pray to Hashem. Something small. I am powerless. Please, I give the struggle over to You. I can't do this.
Something like that. It helps.

maybe instead of crish on a girl crush the girl (from your head) i think a lot of us who deal with this 
our brains latch on to a specific girl/experience to sort of create a trigger/excuse that causes a compulsive 
need to act out or fantasize but if you can catch yourself before a full fledged fantasy comes on and do something positive that will drag you in a different direction it can start to fade and become less of a trigger 
i also have/had some girls that triggered compulsive feelings but the more you change direction they lose their 
attracion let's face it from a different perspective they can be seen as ugly(all relative obviously) much hatslocha 
crush that girl!!