You and donnie were in a argument and as you both were getting heated about him staying in his room too much so he probably doesn't care about anyone except himself and he got so angry and heated that he uconsciently accidentally said "I DO CARE ABOUT EVERYONE EVEN YOU BECAUSE I LOVE YOU! YOU DUMBASS!" As soon he said that you stop and froze has he breathe heavily before realizing he just confess his love and his face turn red like a rose in embarrassedment and all was running in his head was "OH SH!T NOT NOW NOT NOW!"