Assalamualaikum

I wanted to know I use to do zina with a girl, since I dont love her I dont want to marry her gave silly reasons and I left her in our country and came to England recently, Iam I suppose to marry her according to Islam. I know the mistake was both of us and I feel that we did mistake for years and now Iam trying to be a good beleiver leaving the girl in the dark and suggesting her to forgot it, go and get marry and live happily with someone. I understand its the mistake of we both. I know Allah will definetely forgive us since I strictly asked for repentence but she always cry and beg me not to leave her like this spoil her life. What Iam I suppose to do according to a good beleiver leave what people & family say and go back to the country and get married or just forgot it and concentrate in prayers.