Ex-girlfriend's jealousy is making my life hell

Dear Mr Bitter Guy, I need dating advice ...

I kissed this guy i know from school but had never spoken to before last thursday and saturday when out at a club. On thursday we kissed once in the club and then all the way home in the taxi (he lives near me and there were others in the car too). Then on saturday, he arrived late, i didnt no he was coming, and he saw me and came over to me and we started talking. Then from about 11 till 1:30 we were together kissing, talking and mucking around, like singing all the corny songs that came on. I knew he used to go out with a girl in my year but i heard they broke up at christmas.

After saturday night, i heard that they had gotten together after that and they only broke up the saturday before. Now his ex is soo angry at me and has spoken to me twice both times shouting at me. Im not a shy person but i am quite quiet and i wasnt preapred for this. She said she cant shout at him as she has vowed never to talk to him again and she is now saying that they didnt break up the saturday before we kissed, they broke up the saturday after, but i no that this isnt true as he called her his ex when talking about her on thursday. She has called me a slut and shouted fuch u to me so many times today. And the second time we talked she threatened me saying that if i ever talk to him she will break my legs and if i ever have a thing with him she will smash my face against a wall. I know it sounds so immature and she probably is all talk but its reli getting to me and i normally don't let these things bother me.

Everyone is on my side saying that i am not in the wrong and her friends are so angry with her and have been comforting me and i no ive technically done nothin wrong cos i thought they'd been broken up for months but her shouting at me like that has reli, as ive said, got to me and i dont no wat to do.

I havent been able to talk to the guy since saturday as i've been away but now im not sure if i will or not, i reli like him we got on so well and seeing as we were only kissing and he didnt try anything else i no he's not looking for sex like the majority of guys are, but still can someone please tell me what to do? Do i stand up to her? Because i could give her attitude back but im not sure i want to, so far ive just let her shout and then let her no i didnt realise how recently they've broken up but she just says im talkin shit and she doesnt believe me. And what do i do about him?

Please help, this is really upsetting me!