Will Allah forgive me for what I have done, and can I repent to Allah after engaging in sexual chat with a young man who broke his promise of marriage?

Allah the Almighty has opened the door of repentance for everyone who disobeys Him, as long as they come sincerely in their repentance. Allah the Almighty says: (And indeed, I am the All-Forgiving to whoever repents, believes, and does righteousness, and then is guided). And a Muslim must hasten to repent and be sincere in it by not falling into sin again, regretting what has passed, and resolving not to return to it. They should rectify their condition and do good deeds in the future, as this is one of the greatest signs of sincere repentance. And fearing Allah the Almighty is one of the best means of facilitating matters. Allah the Almighty says: (And whoever fears Allah - He will make for him from his matter ease). And one must be careful about relationships between boys and girls; for they are among the greatest causes of falling into major immoralities and grave evils.