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You need to maintain your friends relationships from younger days. You need to check-in, maintain a social circle, etc. It takes work. The magic is if you keep your core group close (and it's easier today with the Internet to keep in touch) then when you are able to get together (may be once a year!) you'l just pick it up like you hung out yesterday.
I want to maintain these friendships and relationships but after a point, I’m tired of being the first one to reach out all the time, the one word replies, and all the anxiety surrounding their very late replies. There is no such thing as busy, the average American checks their phone 96 times a day. If they want you, they’ll make time for you. It’s heartbreaking when it goes to this from a point where we’d talk for h…
Life gets really busy for people and they might see the commitment it takes as something they just don't have time for right now. Or maybe you've grown apart.
You can always ask them if everything is alright between you both.