How much hooking up goes on at clubs? Is a girl more likely to cheat when she is mad at her bf?

hello there! well im the only single one out of all my girly m8s of about 15 of us! we go out every friday and saturday and 99% of all my m8s cheat on there blokes n there blokes seem too b the most decent of them all!!! then wen i see there men they say was my mrs well behaved n i have to lie to them! i do belive in most cases drink and a fall out with ur man/woman they will b more likey too cheat! let me know if im any of help!!! hope goes well!!