The WORST guy/girl you've ever dated~!

Well, i have a ex boyfriend, he seems really nice and sweet towards me.. We were really happy together, for the first month... I had to leave for kl for a short trip and he tag along... I was quite close with his cousins and when i came back, he told me that the day when i left for kl, i left one day earlier... My bf went to meet his ex and they did more then just cuddling... This really got me mad... N i decided i needed to thrash things out face to face... He told me he was sick and ask me to stay at home, but i went ahead... To my furious, another woman was at his house and i caught them red handed... While being so sweet with me, he was two-timing or more then that to me... How could he? I mean i was so faithful and i thought he was a really nice guy... He beg me to stay, his mum called me too.. But its no use, i can never forgive him... Now hes attached, but he still calls me as and when and tell me he misses me... See how a jerk can he be, right?