In the last 10-15 years or so I've lost touch with lots of friends (drifted, they've moved away, preoccupied with kids etc).
It's sad, as we don't have many friends now except those we've know for 20-30 years (school/college friends that we see 1-2 times a year).
But there's a few of our remaining friends who never make the effort to contact us (it's always us contacting them) or who either don't reply to messages or take forever to reply. There are 3 friends at the moment in particular who are doing this. Half of me wants to give up on them, the other half wonders if they're ok or struggling (so don't have the headspace to reply).
I'm not hassling them all the time - usually once around school holidays (lots of teacher friends).
At what point do I draw a line under things and forget about them? I feel like it's time, but am doubting myself.