tftnt, Steffi, I realy love the title
We didn't get to see Ethan with his friends very often but from what we saw I think it doesn't look like they were such close group of friends such as Brian and the gang. they were quite snoby and I'm not sure if they could develop much loyelty to each other... plus I think Ethan was mostly loyal to his music and his carrer so much so that he could never be loyal and show true love to another person which is rather sad, really.
I don't think Micheal wasn't loyal to Justin. He didn't like the fact Justin became more present in Brian's life, that's for sure, and his major loyalty was to Brian but he's the one who took care of Justin back in early S1 and then later on in S2 he was even able to bond with Justin to create Rage...