I wouldn't fancy him 'in passing' that's the thing. I have an interest in common with him. Due to the nature of our jobs, I don't see him often but, when I do, we chat about the interest. He's far more accomplished in it than I am and I admire that and would like to know him better, ideally, to improve my own skillset but that is literally all.
I don't know him very well but we get on well enough. But in order to fancy him/find him sexually desirable on any level, I would have to spend a lot more time with him, get to know him really well, laugh with him, spend nights out with him... by the time I'd developed an attraction to him, I'd have completely forgotten I even had a boyfriend.
What you are describing isn’t fancying someone!
The way most people feel is that the see an actor/musician/random person on the street and ‘fancy’ them on a superficial level. It’s not a conscious choice but a biological response to an attractive person.
It has no impact at all on their existing relationship.
But it would be unlikely that those feelings would develop even if i did do those things because I love and fancy my boyfriend.
This is the same with most people though - they see someone attractive and ‘fancy’ them but nothing further develops because they love and fancy their partners.
Are you maybe thinking of an emotional affair rather than fancying someone?
Someone in an earlier post described how someone might 'leave them cold'. That's how I feel about all other men.
I can see it's unusual but it also makes sense to me.
That’s fine it makes sense for you. I accept how you feel.
Can you understand and accept that most other people do fancy random people without that impacting their relationship?
I've told my boyfriend briefly how I feel and he says he can see it. When we go out, he says I'm pretty much oblivious to all other men. I am. I don't flirt. I don't notice men looking at me (apparently). He knows he can trust me because there is absolutely no one in the world who would be a theat to us.
Most people in healthy relationships don’t flirt though.
Most people trust their partners, this isn’t unusual.
In most relationships, there is no one who could be a threat. There are always going to be people who are better looking/nicer body/dress nicer/better hair etc etc but they aren’t ever a threat.
Again, completely normal.
You are considering ending the relationship over something your boyfriend can’t control. That is a threat to the relationship.
I don't have that same security. With him, it will always have to be a choice.
And why would he choose me over anyone else?
This is purely a TRUST issue though. It also sounds like you have major insecurities.
He is lovely and I think he probably deserves better.
Your thought process seems extremely rigid and inflexible. Healthy relationships need flexibility and compromise. Thinking he deserves better, again sounds like insecurity issues on your part. Working on this may really help you