HE DID ALOT OF PARTYING??help?

my longterm boyfriend dumped me for 2 months he said he was bored and he wanted to party...this was 'unusual' for him. i would contact him his mobile was switched off, he said he was playing poker with the boys etc..then he was working saturdays and being nasty to me etc. often on his lunchbreaks or when he was out on the town weekends i would hear the same girl laughing in the background.2 months later he came back too me sorry/stopped working aurday is always attentive/i know where he is at all times. he won't take me into the town he works tho', and sometimes his mobile will ring 1am and he won't answer.do you reckon he cheated\// if so what happened here??