I think it just depends on how your relationship evolved. DH and I have been together since college, so, we have all the same friends. If we go out in the evening, we go out together, because the other couples are also both our friends, and friends we have made since through school for example, or neighbours, are also "couple" friends. Neither of us has individual friends that we wouldn't see socially as a couple.
We have also never not either seen, nor just spoken to each other every day for 35 odd years!
Having said that, over the years, he has spent many weeks away for work, often the whole week, so of course he had his colleagues to socialise with, and I had local friends. He would phone every day though, without fail.
Weird I know, but I have never been out in the evening with a group of female friends, as I just don't have that kind of group. Coffees and lunches yes, cinema, museums etc, but never for a classic night out. Not my kind of thing.
Everyone is different, and as long as it makes you happy, crack on.