Wot shud i do? bit long but i cud really use peoples input...

ok me and my girlfriend had been together for 19 months? towards the end of that time starting last october we've broke up three times. various reasons. The last time we broke up was 3 weeks ago. I ended it this time as i was informed by a reliable source that she had been cheated on me!

We broke up on the tuesday and on the friday i went out for my m8s birthday, i kissed another gurl, nothing memorable about it jus anutha kiss in a club... i also kissed another gurl a few weeks l8a that i had started txting since we broke up.

Recently i found that my gf had spent the night in bed with one o my m8s both claim that nothing happend then but they had kissed earlier in the night, the same night she also kissed another of my m8's and he claims she had tried to take it futher but he refused as he didnt want to use her! She had also kissed two of her gurl m8s one of which i DETEST. i know she is single but it hurts like hell am i wrong for being angry with her?

Theres a possibillity of us being able to try again. This time would be much harder as her parents hate me and mine aren't to fond of her equally. She says she loves me and that she always has yet she has done these sorts of things with lads that were meant to be my mates. The main reason i am worried is that she didnt tell me about anything that has happend i found out from another friend who had read txt msgs. All the things iv found out have been staggerd and im not sure if theres going o be any more coming along..

Is it worth another go? or should i jus try and gt over her?