He said tat he didn't know her..she said ta same thinq but.......now im pissed!?

ok so 2day when i was goinq to math cl i saw them 2 together smiling & talking/ he is my EX & tat girl is a l-3-i-t-c-h......ppl were sayin stuff like he dumped me 4 hurr & crap......my friends asked him if he knew hur..he said NO...same thing with ta girl. IS SHE just getting back at me bcuz i went out with BOTH hur EX BOYFRIENDS?????? PLEASE NO HATER COMMENTS! JUST HELP Cuz ima BEAT THE **** OUT OF HURR!