Well, if spouses count...
I was at a fancy dress do for Christmas 1957 when I saw this pretty blonde on the other side of the room. It took three months before I could get her to look back but she's sitting across the room from me now. That's almost 59 years.
My second best friend is lying on the couch next to me right now. She's snoring. She's been my second best friend for almost 17 years and her name is Zoe. I'll post a picture.