I think it is also really possible that some people react with genuine worry and concern, and aren't even at the deepest level in the least jealous. My dad would have reacted that way. He was a delightful, loving, anxious kind of guy and the thought of me touring alone would've given him anxiety conniptions. I would have loved him anyway. And I would have gone by myself anyway. I always did. And he always found a way to deal with it.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks