I am very Sad And Heart broken

I had decided to end my relationship, it was a opportunity to chat with a friend with a same surname. And out sudden she told me that she is her ex before. out of sudden it reminds me that time "he" said to me how come i add her into her face book. Than she said that i am the thirty party to spoil their relationship. before i start to dating him, he told me that he is single and no girlfriend for 7 yrs, which i found out, he is a cheated and liar. cos before i was dating him, he still with another relationship on, than her ex fed up and broke up with him. his ex ask me before, did he mention about he wan to die, or what. I was so fusy up and call his friend, and ask about did he with him, his friend told me that he didnt with him plus he is finding him also. So this is prove that, he got another gal behind back..I don't care that he got gal friend right now. that moment that he bluff me and cheated me is wrong, i can make him up in the sky and pull him into hell. This time i really lost and Heart broken, when "he" had trouble, "he" asked for help.. i really use the heart and effort to help him, what did i get return, is nothing. Actually i dun want to anything from him, I just want him to faithful to me.. this is very difficult? Anyway this is a hard times for me to get over him.