Is this marriage to this girl permissable?

[yazza]

Asalamalaiykum.
I need to know wether or not it would be allowed for me to marry someone.
I had been in a relationship with this girl for about 2years. The relationship ended just over 3months ago and since that moment i havent spoken to this girl. Allah (swt) has given me the blessing of turning strongly to Islam and I have learnt a lot about the mistakes I made and understand the need for my sincere repentence. The girl has since contacted me and even though I hesitated to respond I felt I needed to make dawat to her, I took the opportunity to enlighten her on what i had learnt and advised her to follow suit and repent strongly. She is complaining of depression and constant thoughts of me etc.. I have told her it is just the shaitan taking advantage of weakness in emaan and she needs to strengthen this by making acts of ibadah. However she did take the opportunity to ask me to consider her for marriage. I told her i cant marry her or anyone else in this situation and the most important thing for both of us right now is to repent and seek forgiveness for what we did and then think of marriage. I told her i wouldnt be responding to any further contact and that she shouldnt try and contact me again as it wouldnt be right.
Since then i have been bothered by thoughts of marrying her or not, no thoughts of contacting her or doing anything haram, just her proposal. I wanted to know what direction to take.
Am I allowed to make istikhara on it? And if I take the proper route of approaching her wali and proposing marriage would it be valid? Do we both need to go through a period of repentance beforehand or anything of the sort? Or is it strictly disallowed completely?
Jazakallah.

[ammardiwan]

Am I allowed to make istikhara on it?

It is highly encouraged you do so

And if I take the proper route of approaching her wali and proposing marriage would it be valid?

Yes. Her being your ex-girlfriend has no bearing on the marriage contract.

Do we both need to go through a period of repentance beforehand or anything of the sort?

You should both in general. No formal procedure is needed. You can search for "repentance" on www.SunniPath.com

Or is it strictly disallowed completely?
Jazakallah.

No, I don't see any problems. Make sure you do istikhara.

[fnaeem]

1) Make istikhara
2) your breaking of contact is the right thing to do .
3) evaluate her religion, and her eagerness to learn the deen independent of her desire to get you back. Will she have the flame to keep growing in her deen if she gets you back as a husband. This is the big one as our nabi told us that the foremost criteria of selecting a spouse should be their deen. You may be ahead of her in where you are at, but its not where she is at, but where she wants to get to as far as her deen is concerned and how quickly. Will she keep striving if she got you back as her husband.
4) As for making dawah to her, get a woman you know to do it. Or help seek out females resources for her. It must be they who carry out the dawah to her. read the story of barseesa here http://qisas.com/stories/191 . Dawah to a girl one of the oldest curveballs/googlies by iblees.

[yazza]

Jazakallahkhayr to all the replies. Inshallah i will make ishtikhara and take the route Allah (swt) guides me towards. Make dua for me and Inshallah i will remember you in my duas also.