Really tiny problem compared to most on this page, I know.
He's a really, really good friend, and I'd be very sad to lose that, so I don't feel that nc is an option I'd like to take. It's definitely never going to happen, although I've very often felt that there is a strong mutual attraction (never discussed). It's been a long time, and I was happy to go with it whilst it was just an inobtrusive fantasy, but now I often find the impossibility of it all getting me down. :( I'm loath to use the 'love' word but there's definitely a big emotional element, it's not just "I want to shag you" stuff.
I'm aware there's a school of thought that says that these kinds of thoughts only persist because I am choosing to remain engaged with that fantasy. I can see some truth in that. I also don't know how to stop. I don't think I want to be in a relationship, with anyone, so I don't imagine meeting other people would help (or be viable - no time, no money, no childcare).