I think the problem becomes one of time and need plus money doesn’t it.
Say you are single no caring responsibility’s just work and home. Then you have every night and weekend to catch up, go out have a natter with friends and family. You also have nobody who’s always there as a sounding board, an emotional help, a travel buddy and so on so friends fill all these gaps.
Add in a partner and now that’s taken some time away, your partner is now often your sounding board and emotional help, you also now have more time restraints as it’s not just your friends and family, it’s now spending time just with them, spending time with their family as well as your own often, what might of been yours and Becky going for a holiday together so you where not alone is now you and your partner going. That’s now less money/annual leave to use for friends.
Then you get married and have children. Now you’ve got even less time for the friends because the children and nuclear family time trumps all.
It’s about how relationships including just friendships have to change and evolve as we get older and have more commitments in life.
It’s not dropping friends like hot turds that’s wrong but it’s about knowing that an every other day catch up is often going to slip into a once a fortnight or so.
Doesn’t mean you’re not friends you are all just bloody busy. I’ve got friends I’ll talk to once a week others I might not talk to for a month, it’s never strained though it’s always like we only spoke yesterday when we do catch up.