Sounds like he's in very deep replay and the young guy hanging w/him is there to adore and admire him, i.e., they need validation all of the time from others. Your h is lapping up that friendship and the way that young guy is around him. As for his clothing of choice...very typical of the MLCer to want to wear "younger" looking clothing. Again, look outside of themselves for their happiness.
I'm sure the younger guy is just a pal to hang w/and nothing more...but I can see where kml questioned his sexuality. MY PI thought my xh was a cross dresser after seeing some of the web sites he was visiting while in la la land.
He'll change up his clothing choices and friends again as he continues to grow up.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.