Can relate sorry יסורים של אהבה
Took me a long time to move on. A lot of crying to hashem. A few years later I stopped shuddering when I heard the town she's from. Now that I write this a few years after that even I realize my kids babysitter has the same name as her and she didnt even cross my mind until now ... And shes just a girl now its OK.

Its rough , but keep on hanging in there don't do dumb stuff I really really feel your pain. 

To relate to a woman in a way that she is desiring and enjoys one connecting to them, listening to them, caring for them, is the shoresh of the yetzer nashim that mankind has. So remind yourself just to connect with her in anyway your mamash touching upon the tenuah of being בא על הערוה. Any connection especially if she’s gone through trama and craves attention and love is terrible. Keep it up and stay away!!!

Hi tzadik!
I had a similar story...
You did yours, blocked her number,now delete it so u wouldn't be able to contact her in the future if you'll have an urge etc. .. just form my own experienc, sometimes u may be so obsessed with her.. or feel guilt for her or pity her .. so u may have very strong urges to contact her.. and have an urge to follow your urge/feeling and not your logic and what you really want... From personal experience always be on alert to whenever it comes to a situation...to start thinking logical straight away!!! Although you'll have a special urge not too!!! Too I would highly recommend u to go to a therapist or even spk with a good trustworthy friend, without giving her name of course...
I don't know if that was helpful, there's very deep psychology behind this I just cannot bother typing so much

Crazy nisayon I respect you for staying strong.keep it up

I am not much of a expert, but using willpower alone or "just" deleting her number will not work. You will need to have technique to get away from the nisyaon. everyone has a different method that works for them. some of the "mind trick" videos on gye have been very helpful for me. maybe developing a better relationship with your wife may help. in doing so, the fight won't be  you VS her which is essentaily fighting the yetzer hara head on(wouldn't advise on that)  but rather replacing her with a different girl aka your wife, Like bringing your wife on a vacation just you and  her- as long as you aren't going to fulfil fantasies as some users here reported (story is posted somwhere I'll try to find it). same with porn- fighting it head on simply doesn't work the adrenalin has to be replaced. for ME (what works for me doesn't always have to work for everyone) making money gives me some of the thrills in a kosher way or going camping for a few days (a little unconventional but try having no cell service for a day or 2). go out there and find what clicks for you and the one and ONLY girl (wife) in your life.  You give me encouragement by coming on here and telling your story. all the best