Gatsby- Party Person?

My question is about the behaviors of Gatsby. All along, we do not see him that happy, and he does not seem like a care-free person. He throws many lavish, fancy parties, but we never see him particularly enjoying himself. Does Gatsby have a reason he hosts so many extraordinary parties? Is he so rich that he is merely bored like Tom and Daisy? And, in addition, why is Gatsby trying to become acquaintances with Nick? Nick does not seem like a very memorable person especially in comparison to the countless other young people at Gatsby's parties. In my opinion, Gatsby is a perfect host, providing guests with a lovely atmosphere to party and drink. However, for some reason, the way Nick tells the story, there is something more mysterious going on. At the same time, Gatsby shows internal pressures that possibly drive his motives for these social gatherings. Through Nicks eyes, we see an intrigue caused by this strange, compelling character. Clearly, Gatsby lives alone, but hosts these parties, and then seems to stand alone even at the parties. He single but does not seem to be actively looking for a partner.