Over Text または the internet!! it happened to me once over the internet!!! he was having a bad day.. and i asked "Whats Wrong?" and he was like "my real girlfriend broke up with me.. ur juust a game to me... i never likes u... i just wanted to get some from u then i would have dumped u but ur stubern and wont give it to me soooo yeah i wanna brake up!!!".. i was like "wow after all that i really dont care!! and now i have trust issues!!!
*Dumped, for all of あなた wondering what the hell it means to get "dumbed".
I would think it'd be pretty damn bad if your 日付 took あなた to a Japanese ディナー place type thing, and あなた ate a lethal dose of fugu fish, and as あなた were in the hospital your 日付 forgot あなた were allergic to ネコ (pretend あなた are in this) and brought あなた a cute kitty, and as your throat slowly closes up on あなた from swelling, he/she says, "The cat was only to soften the blow when I was gonna break up with you...Oops! I let the cat out of the bag!*"
Well i don't think there is ONE worst way there are just もっと見る lol.Like getting dumped over a text,or for your best friends,for no reason(i had a friend which her boyfriend broke up with her through a text where were もっと見る nonsense written like 'there is no もっと見る chemistry) または many other ways :P.
When they are too coward and get their friend to do it. That pisses me off. または when they do it in front a lot of people. I don't care if it's via text message, I don't give a rats ass, as long as it's between me and them.