Whats his damn problem?!

I am a tomboy and I have a best friend (darius) who I have be with my whole life…we do everything together (eat,sleep,play basketball,hang out,etc.), our parents are best friends,and I’ve never been intersted in guys. so he has a girlfriend and she gets really jellious and she just tells him how much she doesnt like me and stuff.the whole last week he had been avoiding me and last night he just shows up while im outside playing basketball and says “ why didnt you tell me you f-ing like for me?” and I said “ if you are gonna come over to me on my f-ing property I’ll be the one asking the f-ing questions! What the f* iz with you? “ then he said “why didnt you tell me?” I dropped my ball and looked at him and said “it wouldnt matter. You have a girlfriend!” then for a second he walked up to me about to say something but he stopped and said “yea. Whatever…forget it” then turned around and left.I dont know what was up with him, do you guys have a idea?