Hi, I'm an addict. Although I've been clean for quite some time now I still call myself an addict and not a recovering addict. Let me explain myself with a story.
The Kotzker Rebbe once had a talmid who thought he was ready to tackle the real world. "Let me go out into the world of business" he asked his Rebbe. The Kotzker replied, "Do you see the Malach Hamaves (Angel of Death) standing behind you with a sword?" The talmid replied with an honest "No". The Kotzker said, "that means he already cut off your head".
I think the point is clear. You can't let your guard down. Hitting 90 days doesn't make you invulnerable to new attacks. Just because you haven't fallen doesn't mean you are not about to. The Kotzker was pointing out to us, that as soon as we fail to realize that we are in a place of nisayon and in constant danger, then that is when we lose the battle.
Remember, he's behind you with the sword, because if not, he has already cut off your head.