I adore my twin DDs (now early 20s), but have always made time for things that don't involve them.
Made a big effort to keep up friendships and meet for dinner/drinks/coffee, even when in the thick of twin nappies/teething etc. And also made an effort not to go on and on about them as that's very boring for other people.
Always made an effort to go out with DH and away for a couple of days a year (we were very lucky having his parents nearby though who were willing to have them, which I appreciate not everyone has).
Went back to work when they were nearly 1, part time, which was a sanity saver. Really enjoyed my days off with them, but equally enjoyed adult conversation in an office, and the commute with a book/paper/music.
So now they've flown (or almost flown) the nest, I'm not sitting here bereft wondering what the next stage is bringing. We're very close, in contact a lot with the one who doesn't live here, but it's not suffocating or all consuming. That's not fair on our DCs.
I have a friend who followed her DS to his uni town, sold her house and moved about 10 min away from him 🙄, madness, poor sod.