Last summer I had what will be my last lunch out with 3 former teaching colleagues, I would have said "friends". Only 1 is no longer teaching having taken early retirement. I retired 6 years before.
They talked non stop about their holidays, elderly parents, work. Fair enough. But they know our situation with DH's health (and they know him) and did not ONCE even ask after him. They knew DD2 had had a baby 2 months before - did anybody ask about her or the baby?
So I came to the conclusion that when you no longer have things in common the time has come to move on. People who do not understand the things that are central to your life (whether it is grandchildren, dogs, partner whatever) will, if you are lucky, take a polite interest. It made me feel I must be a totally boring person and that my life as it is now, was of no consequence .
Do I bore for Britain about my DGCs or DH's issues - maybe it was a lesson to me but not a comfortable one.
So, long story short, not necessarily jealousy, but self-centredness and selfishness on their part.