He loves his fiancée but she wants to cancel the engagement; what should he do?
Question

                I am a 25 years old man. I engaged my relative about one year and half ago. Before this we had a love relationship for about two years. We both are religious, abiding by prayers and avoiding any haram. We fell in some sins many times but, Alhamdulillah, repented to Allah and we are seeking His forgiveness day and night. We have been alone together many times, which led us to do things like kissing and touching. Since that time we repented and are asking Allah to forgive us. Now my fiancée wants break our engagement for very small and meaningless reasons. Everyone objects to her reasons, her family and my family, we all relatives. She is also hesitant about this decision. We love each other for many years and I do not want to lose her ever. Please guide me to the right behavior I should do with her. I wish I receive an answer soon as I am passing this problem at the moment and do not know what to do.
Praise be to Allah.Firstly: 
What you have mentioned 
    about your relationship with your relative and the haraam actions that you 
    committed is something that is very regrettable when it happens among 
    Muslims. It is indicative of fathers’ and mothers’ shortcomings in 
    protecting their daughters and preventing them from mixing with men, and 
    being careless with regard to relatives concerning this matter. 
We praise Allaah for having 
    given you insight into your mistakes and enabling you to repent and regret 
    it and seek forgiveness. We ask Him, may He be glorified, to forgive you and 
    accept your repentance. 
Secondly: 
You should find out the 
    reasons why this girl wants to cancel the engagement. You could delegate 
    this task to one of your female relatives. There may be reasons that can be 
    remedied. 
If the girl insists on her 
    position, then all you can do is be patient and seek reward, and perhaps 
    that will be better  for you, because one does not know where good will be, 
    and with whom he will find happiness. 
You should also pray 
    istikhaarah, asking Allaah for guidance, and ask Allaah to help you to get 
    married to a righteous woman. 
Beware lest you be one of 
    those who are weak in faith, who – when they miss out on something they had 
    wished for – lose their strength and willpower, and indulge in haraam 
    things, or they fail to do obligatory duties, or they announce their 
    withdrawal from life. That is the attitude of those who are hopeless and 
    filled with despair. But the believer knows that everything happens by the 
    will and decree of Allaah, and that he will never get anything but that 
    which has been decreed for him. Hence Allaah says (interpretation of the 
    meaning): 
“No calamity befalls on 
    the earth or in yourselves but it is inscribed in the Book of Decrees 
    (Al‑Lawh Al‑Mahfooz) before We bring it into existence. Verily, that is easy 
    for Allaah.
23. In order that you 
    may not grieve at the things over that you fail to get, nor rejoice over 
    that which has been given to you. And Allaah likes not prideful boasters”
[al-Hadeed 57:22, 23]
We ask Allaah to guide you 
    to what is good for you and make it easy for you wherever it may be, and to 
    enable you to have a happy and successful marriage by His leave. 
And Allaah knows best.