GLEE HEADCANON: Jake, Puck, and Finn.
I think part of Jake’s acting out as of late comes from feeling like he was abandoned by Puck.
I think, when Jake is alone, with no one to talk to or sleep with to keep him distracted, he thinks about his brother, and how nice it was to feel like he finally had someone he could depend on, who would always have his back no matter what. And it just makes him angry. At Puck (for bailing). at himself (for not being a better brother)…
He knows it’s wrong. He knows it’s stupid and selfish and pointless and immature and he would never, ever say anything about it— not to anyone— but it’s true. Part of him is angry at Finn. For dying. For making Puck leave. For being Puck’s brother first, being more his brother than Jake could ever hope to be.
Because Jake’s pretty sure that if he had died instead of Finn, Puck wouldn’t have joined the Air Force. He might’ve been sad. Might’ve gotten drunk, might’ve started some shit, fought a little, fucked a little, maybe even cried a little. But he wouldn’t have left, wouldn’t have dropped out of college and given up on his own life to go live someone else’s dream. Because he would’ve had his bro to see him through it.
Part of Jake hates Finn for taking his brother away from him.
(The rest of him just hates himself for feeling this way.)