there really is a difference when you share an experience with someone. i keep thinking back to an evening in SoCal a year ago... and i saw one of the most breath taking sunsets it was pure sky and mountain-scape interaction. every time i think back to that day a smile is placed on my face. but mentally i look to my right and look to my left i realize there was no one who was physically present in that day. dont get me wrong experiencing something so marvelous bring me genuine joy. currently typing about that day theres a smile on my face. but how much better would that day have been if i had a friend beside me. idk.
since everything is relative, personally i believe real happiness is being able to share it with someone knowing they'll never take it away from you but add on to the joy.