THINK MY MAN DUMPED her???

my man went on a 2month break with me, after 6 yrs together, and during this time his mobile wud be switched off work lunchbreaks and weekends...when I got thru some loud party girl was laughing in background. I also overheard his workmate ask him about 'debbie'?? and they were laughing!! he was doing alot of clubbing etc, she seemed loud and obnoxious.. and he was being nasty to me. after 2 months i ignore him, he texts me to come back i forgive him. he seems sorry, there is no trace of this girl anymore.what do you reckon happened here??