The last person I was involved with was a hoarder. It seriously lowers one's quality of life.

Not only did he have unusable rooms but there were pathways in the so called usable ones. He couldn't eat at his dinner table because it was covered with stuff. He couldn't cook in his kitchen without having to move things out of the way. He thought of himself as a collector rather than a hoarder. For awhile he moved in with me and bought piles of stuff with him. When he left he took a bunch of my stuff with him as if he didn't have enough already.

He was not bipolar or ocd or have social anxiety although he invented a personal life history that had no bearing to reality. He lied about big things and small, but that is also not a diagnosable disorder... I ended up with the belief he had a personality disorder.