Can someone tell me how to break up my boyfriend in a good way?

I caught my boyfriend talking with a girl, holding hands and sometimes they texting. He lied to me that they are just cousins.. I hate liars! Pleae give me tips how to break up this is my first time. huhCan someone tell me how to break up my boyfriend in a good way?
U have to be strong and know what really u want,and then when u take the correct decision go for it.just be honest and do not let him using u.Can someone tell me how to break up my boyfriend in a good way?
i had a bf do something very similar once and lie about it to my face, and what i did was invite him around luring him with all the wonders of my body. Then get some big but handsome men to come around hide in the bedroom then come out and exit him off his feet, off the premises and use his head to open the door. he never lied to me again as a matter of a fact he never spoke to me again. i hate liars
Tell him.. I like honesty and if i let this one pass by.. you are gonna do it again and again and again.. lets just be friends. ;)... simple as that... you don't need to be suffering over guys that want other chics.. there is too many guys out there needing you :P
If you dont want to bring up the other girl thing again, just sit him down and say something like ';im sorry, this isnt working out, i want to break up';.
dont even tell him why, cuz hes gonna know ur hurt juz tell him u dnt feel the same anymore %26amp; u feel u need 2 go solo thats it dnt answer any of his questions dnt say we can still be friends juz leave it at that
just say, ';sorry, it didnt work out, im outa here'; and leave. dont do anything dramatic that youll regret later