Selam aleykum sister,
I'm very sorry to hear about your situation, can't even count how many similiar I have seen happen subhanAllah.. May Allah protect us!!
It's good you're repenting about this and wishing to get over this man, it is better for you sister. Ask Allah for help and forgiveness, sincere forgiveness and He will answer inshaAllah. But sister remember, if you keep doing the same sin (talking to him, being with him etc), your dua might not be answered. So...
1 - Stop talking to him, less and less each day... Don't let him come to you and start a big conversation, let him pass away, go away from him, because that is the smartest for you to do. Keep in mind, as you ignore and avoid him, that there is inshaAllah something better in store for you, you DESERVE a good Muslim man, you deserve to have it through the halal way, you deserve to achieve it (find a good man) through Allah's mercy and love and not through Shaytaan's trap.
2 - Sister Umm Hurairah gave some great dua's there, mashaAllah. As you see they are from the Qur'an, if you don't speak Arabic then it's still possible for you to find the same dua with romanized Arabic. Of course you can say it in English too, but hey, if you try it in Arabic you'll be one step closer to know more of the Qur'an, inshaAllah. It's good for one to occupie every free time with either studies/work or of course, remembrance of Allah. Much dhikr is good for the soul!
3 - As I said in the beginning, one must keep asking for forgiveness and pray for guidance and strong Emaan inshaAllah. "Seek forgiveness of your Lord. Verily he is ever most forgiving" it says in surah Nuh. You must do much isteghfar (seek forgiveness).
The Messenger of Allah, sallallahu `alaihi wa sallam, said: "The master of invocations for forgiveness is that the servant says:
'Allãhumma 'anta rabbee, lã 'ilãha 'illã 'anta, khalaqtanee, wa 'anã `abduka, wa 'anã `alã `ahdika wa wa`dika mastata`tu, 'a`outhu bika min sharri ma sana`tu, 'aboo'u laka bini`matika 'alayya, wa 'aboo'u bithambee, faghfirlee fa'innahu lã yaghfiru 'aththunooba 'illã 'anta.
O' my 'ilãh You are my Lord, there is no 'ilãh but You. You created me, and I am your bondservant, and I will stick to my covenant and promise [of faith and sincere obedience] to You, as to my ability. I seek refuge in You from the evil of what I have done, I acknowledge, to You, your bounties upon me, and I acknowledge, to You, my sin. Thus forgive me, for none forgives sins except You.
Whoever says this as he enters upon evening, then, dies that night, he would enter Paradise; and if one says this as he enters upon morning, then, dies that day, he would enter Paradise". [Al-Bukhari]
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It is reported in Saheeh Muslim that he said: "I seek forgiveness one hundred times in a day." [Muslim]
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`Abdullah ibn `Umar said: We counted in a single sitting the Messenger of Allah, sallallahu `alaihi wa sallam, saying one hundred times:
"Rabbi-ghfir-lee wa tub `alayya innaka anta-t-tawwabu-l-ghafoor."
[My Lord, forgive me and accept my repentance, verily you are Acceptor of Repentance, Oft-Forgiving.]
[Ahmad, Abu Dawood, Ibn Maajah]
Allahum-maghfirli dhanbi kullahu,diqqahu,
wajillahu, wa awwa-lahu, wa aakhirahu
wa 'ala-niyyatu wa sirrahu.
(Oh Allah, Forgive me all my sins,
great and small, the first and the last,
those that are apparent and those that are hidden)
[Muslim:1/350]
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اللهم اني اعوذ برضاك من سخطك, وبمعافاتك من عقوبتك, واعوذ بك منك, لااحصي ثنء عليك انت كما اثنيت على نفسك
Allahumma inni a'udhu bika bi ridaaka min sakhatika, wa bi mu'a-faatika min oqu-batika,
wa a'udhu bika minka, la uhise thanaa'an 'alaiyka anta kama ath-naiyta 'ala nafsika.
(Oh Allah, I seek Protection in Your Pleasure
from Your Anger, and I seek Protection in Your
Forgiveness from Your Punishment. I Seek Protection in You from You. I cannot count Your Praises. You are as You have Praised Yourself.)
[Muslim 1/352]
Here and
here you can find some more duas the like, with both in Arabic, romanized pronunciation and translation!
InshaAllah, this will all be over soon sis!! You're in my dua's, bi'idhnillah!