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I sure wonder why that is.

Eddie was ignoring Buck and brushing him off, seemingly unconcerned for Buck at all, but we know the real Eddie is very in tune with Buck and knows how he feels about being abandoned. I think here is where Buck's insecurities amplify Eddie's behaviour almost to a comical level. Eddie made a new friend therefore he likes this new friend more than me and is going to replace me with him. Even Chris won't stop talking about this new guy. Maybe they won't want me around anymore.

Then Buck's jealousy turns into anger. He gets a little too competitive in a basketball game and Eddie gets hurt. But no, Eddie doesn't just get hurt, Eddie is hurt by Buck himself. Eddie is lying on the floor writhing in agony, even though it's just a simple sprain, and it's all Buck's fault. I've hurt my best friend, have I done it on purpose? I must've done it on purpose because I was jealous. And now Eddie doesn't wanna hear from me. 

Then we come to the way Eddie has been coming off aside from his behaviour with Buck. Eddie is stunningly joyful. He is all smiles and happiness like the sun itself rises and sets on him. Or at least, that's how Buck sees him. 

Eddie is also suddenly, as many have already pointed out, acting "straighter" than he usually does, with the high fives and chest bumps and "my man!". Or, again, that's just how Buck sees him, even subconsciously convinced that Eddie would never consider him romantically because Eddie is just the straightest guy out there. Complete heterosexuality. 

You wanna tell me that teenager!Buck, who was borderline suicidal in his attempts to get his parents attention, didn't go around provoking bullies and getting into fights?

Buck, who worked as a bartender, didn't get in fights with drunk guys at the bar?