How can I get him to tell the truth about cheating?

I went out with this guy for six months and we broke up ....he told every one stuff that wasent true and he cheated on me while I was gone for four months ....he told every one that he hadent talked to me in forever and he would talk to me every night ......so now were broke up .............and im going out with justin now and I love him but I cant fully let go I dont want to let go of alex .....but the only way I can let go is if he tells me the truth about the cheating and the lying ,and telling every one he would b*tch slap me if I dident do something for him ......I busted my ass to get these nickelback concert tickets he said" he was going to dump me right after the concert " and the only way I can let go is if he tells me the truth about the whole thing ...........what should I do ? what do you think/

You should NEVER jump into another relationship so soon after a breakup! You cant possibly love the new boyfriend if your still hung up on the old one! You need to just close the door on your ex, and dont EVER look back! What makes you think hes going to tell you the truth now? Start concentrating on your new relationship....and leave your ex alone!!