What is the validity of a man's claim about knowing the details of the questioner's life, including marital and reproductive problems, and the existence of a treasure in his home? Does his interference in this manner indicate a strong relationship with Allah? And what is the advice regarding persistent marital problems?

This man is an impostor, and he might be seeking help from the jinn. You must completely cut off communication with him. As for your marital problems, you should identify their causes and address them naturally. Perform ruqya on yourselves, and continue consulting doctors regarding pregnancy. Regarding the treasure, do not preoccupy yourself with it, lest you open a door to evil for yourself.