Does the intermittent practice of the filthy habit for 3.5 years cause harm upon marriage, and what is the way to forget the disturbing clips and stop this habit, bearing in mind the commitment to fasting and prayer?

Whoever is addicted to masturbation must beware of forbidden gazes, which are the main cause of this addiction. As for its harm after marriage, one who repents from it is like one who has no sin. If a person repents sincerely, Allah will cure him from its effects. Your regret and your determination not to return to it are evidence of the sincerity of your repentance, and you must not despair. Allah forgives His servant and accepts his repentance as long as he sins and seeks forgiveness, even if the sin and repentance are repeated many times, for Allah is Oft-Forgiving, Most Merciful. As for delaying prayer because of this habit, it is one of the major sins and greater than performing the habit itself.