I think the concept of anyone being ‘jealous’ is quite childish, it’s often used as an excuse for people dropping friends but often it’s more because the friend accusing someone else of ‘jealousy’ is actually being annoying or unreasonable.
For example, often it’s around weddings - person getting married has unreasonable expectations of friends, who back off. They accuse former friends of being jealous rather than recognise they’re being a bridezilla.
Or person gets a new job/car/house etc and becomes a real bore/snob about it. Again, friends get bored and back off. New job/car/house friend accuses them of being jealous, instead of realising they’re being a dull money bore.
The only times I’ve actually cut off friends was once where someone was openly cheating on her husband and I wanted no part in knowing about it (she was using nights out with me as a cover story), and another former friend had an alcohol problem and nights out became just awful.
I’m sure actually both of these could be twisted into me being ‘jealous’ if they tried, jealous I didn’t have as much male attention, jealous I’m no fun? Couldn’t care less, it’s up to me who I spend time with.