Am I being petty?

I’m a grandmother of 3. They are 21( he’s a marine) 16 year old girl and 10 year old girl. The one that’s a marine used to be stuck to me like glue. Since he’s stationed in California, he never texts or calls me. The 16 year old is the same, barely no contact. Are there other grandparents out there that are going through the same thing with their grandchildren? My feelings are hurt.