What is the solution to the problem of increased lust when speaking with one's fiancée, which leads to masturbation due to the inability to have a wet dream to release it, and is what the young man is doing correct given his current inability to marry?

Your fiancée is a stranger to you, and it is impermissible to speak with her except out of necessity and in a way that does not lead to temptation, because your conversation with her arouses your desire and leads you to masturbation, which is forbidden. You must repent and strive to complete the marriage to protect your chastity, knowing that facilitating marriage is a cause for blessings. Sit with her guardian and come to an understanding with him, and supplicate frequently. If the marriage is facilitated, then praise be to Allah; otherwise, fear Allah, be patient, resort to fasting, keep company with the righteous, and occupy your time with what benefits you.