>>92895058>Marco actually has more friends than Star now, doesn't he?
Star is his only real friend, maybe Tom and Sensei too, plus his girlfriend. And Starfan13 if you take the livechats as semi-canon.
Marco's pretty popular now in school too, but we hardly ever see him socialize with anyone but Star.
Even hosting that end-of-the-year party, he spent the whole time with either Jackie or Star, and people weren't necessarily showing up on the basis of being personal friends with him. They could have just as easily been showing up for Star, or just to hang out with friends who were already invited. The Diazes are the kind of parents to host an open party like that.