Dickens
VioletSky
I don't think you need to worry unless your friendship changes
I think you're right.
One couple being friendly with another couple in a group does not mean anything other than the fact they obviously get along well.
This is not about couples in a group this is about personal long time individual friends .
You say that you didn’t mind becoming friendly with one of your close long term friends but , would you then invite them to your place without even considering your other close long term friend ? Wouldn’t you think about their feelings ?
To find one good friend in life is not easy , even harder to find two , but for that one good friend to make arrangements with the other one of your other good friends , excluding oneself, that , in my opinion , is just plain hurtful and thoughtless .

