I normally don't respond to these kind of posts, but I really REALLY despise people like you...so I will take the time to lay out the game mechanics and explain how I know that you're full of it.
First, when I went through MY nether portal and came out near yours my portal was still there and active. It was within 80 block (that's including the y axis, Pythagorean op), given that nether portals automatically link up with a previous nether portal FAR within that range (I believe the numbers are 1024 overworld or 128 nether blocks) That portal could NOT have naturally generated within the range of mine. Further, my portal had a HUT built around it and 2x1 open space to exit (something that at LEAST should have hinted it was unnatural). FURTHER the second time I came in, and when I knew to ban you, the island YOUR portal was on, was not only smaller but had nothing under the base floor level anymore (which wouldn't happen unless you made a concerted effort for it to happen) and MY portal was gone. Now go waste someone else's time and get out of my post.