Yes envy is tough.

If I’m reading this correctly you were the one who introduced 3 female friends to your girlfriend? I think it’s rather wonderful that you were part of that - you’ve played a part in a great thing for these people.

But I’m also reading you feel insecure about the future, what might happen if you split up for instance. I’m a ‘what if’ thinker sometimes and it can be exhausting- and often the thing I’ve worried about doesn’t happen anyway.

What if you don’t split up, it’s possible you could have a good future together and these friendships may continue too (although not all friendships endure so it’s also possible that they might not be part of the future). It’s impossible to say what the future holds.

Your gf and your friends chose you to be in their lives, perhaps reminding yourself of that may give some perspective when you feel insecure?