I am absolutely fascinated by whatever the hell is going on between Shanks and Buggy. Are they best friends? Are they mortal enemies? Estranged brothers? Divorced lovers?
I honestly don't know because I don't think they know. The fact the two of them have wildly different ideas of what their relationship is does not help. It also doesn't help that the more we learn about them, the more everything we know about them shifts.
When we're first introduced to them, it's separately and with the definite impression that Shanks is the good guy and Buggy is a bad guy who hates Shanks due to a 'betrayal'. Then we're shown the 'betrayal' is something simple and stupid and is as much, if not more so, Buggy's fault than Shanks.
Then we find out Buggy lied about what the betrayal actually was followed soon after by the revelation that Shanks ADORES Buggy. In fact, he's so friendly with Buggy that it literally changes how the rest of the world interacts with Buggy. All because one of the Pirate Emperors is treating this pathetic, wet mop of a clown as a beloved equal.
Add in the fact that, by the current point of the story, we are well aware that 'good' and 'evil' are very much relative and... well. For all Buggy's still a villain, we've seen Buggy pull off more relatively 'good' things than we've seen Shanks do. In fact, some of Shanks' more recent actions are extremely questionable. Honestly, the further into the story we get, the more people like the clown and the more people start wondering what the hell, exactly, is Shanks up to?
And then we finally discover what the 'betrayal' actually is. And, wow, does it hurt. Because it's "I love you enough to give up everything for you, including my dreams" only to have the rug pulled out from under you. It's cutting yourself down until you don't know who you even are anymore in order to fit in the box you feel you have to fit in for the relationship to work at all. It's being so codependent you can't imagine not doing everything you can, including hurting yourself, to make sure it works. It's jealousy and anger at being forced to do that and not being able to express it because it's aimed at someone you love and you know the truth would devastate them. And it's leaving because staying would be worse.
It's also "I love you! I need you! Please stay!" and not understanding why love isn't enough. It's loving someone enough to let them go and waiting for them to come back (please come back). It's saying, "I love you," to someone and getting, "I wish I didn't," in reply. It's knowing something is wrong but not what so you can never fix it, no matter how hard you try. It's loving someone so much it's hurting them and not knowing that until they suddenly hurt you back.
It's devastating. And so much of it could be solved with communication.
And therapy. These two need so much therapy.