ANSWER: If they commited zina, then they must first repent sincerely, cut all communications, wait until she gets her menses and then he can propose to her father and get married. https://islamqa.info/en/answers/87894/he-wants-to-marry-a-girl-with-whom-he-had-a-relationship

Read more

ANSWER: There is no specific dua for this. Make istikhara once you have made a firm decision and if there is any good in it for you, Allah will facilitate it for you.

Read more