Lyric discussion by dorigen 

Cover art for Hello lyrics by Dirty Little Rabbits

I think she is talking about rekindling a relationship with someone from her past, from a time when she felt herself and had people around who loved and understood her.

At some point, things started changing and she ended up in a situation where she was out of her element (with the wrong group of friends, maybe strung out on drugs, depression, etc.), but something happened where she just wasn't being herself.

Her friend helps her remember who she is, either by just being there for her or else helping her come off drugs. He helps her come "home" as she mentions several times in the lyrics.

The reason I think it might be drugs is because of these lines: "Dragged me from a drug", "I was so far out of my head", "colors and people moving way too fast"

I prefer to think it was a situation in which she was with the wrong crowd/in a bad place in life, but only because i went through a time like that myself and I can relate :)