This dependency is far more worse than going solo for a soul who just wants to travel. Instead of being worried while planning the trip, about a phone call that goes "Hey man, sorry i can't make it, you guys carry on." just go by yourself. Don't let others stop you from doing what you love. Go solo, meet some new people maybe at a backpacker's hostels from different culture and background, learn some new stuff, listen to their stories and embrace the thrill of traveling solo.