What are signs that he cheated in the past?

we broke up for a few months bcuz this ho said they did **** the day before we saw eachother in court...wen i accused him (the ho told me ) he didnt say anything nd i left him he says it was bcuz we needed to break up (we were not good its tru) but now 4 mnths later were back n he says he didnt cheat shes talkin smack....but now hes sooo much nicer then he ever was...will a guy admit it eventually...or do u think he didnt cheat??? his story makes sense but he did lie about other thingz in the pt (sleeping with girls while we were brpken up) .....wat do u thnik?