I work in a job where we work alongside other companies i chat to alot of people and lots of become good forever friends. Recently i made friends with a single mother also who does the same job we chatted about issues in work etc and her little girl likes horses so we swapped numbers and i said she should bring her little girl down one day to see my horses, so weve text a bit theres nothing in them. One night my gf went through my phone and said who this girl both flirting i said there no flirting its about work etc just general moans about the job. So she argued regardless. I now dont speak to that girl as much because of the agro i was getting. Then yesterday afternoon my gfs work called saying someone rang up asking to speak to her using her full name saying she needed to come in and speak to her regarding her gf Zoe. Basically my gf works as a manager in a gym. So off she went after screaming at me what have you done!! I replied nothing. She came home told me this girl had been in said i was her gf etc i just sat there confused i said what? She said shes long dark hair girlie i said i havent a clue what ur going on about then she said tell the truth i said i haven't done anything other than make friends with a girl and offer her little girl a chance to spend time with my horses. She then said no one came in she made that part up!! Wtf im so confused right now and also dealing with some mental health issues. It should be the other way around as my gf admitted to cheating on nearly every gf shes had. Shes not speaking to me so i dont know what to do anymore just feel very broken and upset.