What can be done against a cheating girlfriend?

I was in relationship with my girlfriend for around 7 months. I got attached to her very much financially ,physically and in every aspect . Before relationship she told me i had two boyfriend and i was physcial with one of them but i ignored as it was simply her past . But after 4 months of relationship she told me that there was a boy who was his bestfriend only but she was physcial also with him . I got very irritated as she told after soo long . She added that she tried to be in relationships with him but due to physcial thing and relationship issues their friendship was getting spoiled and she didnt wanted to losse him. But recently there have been a lot of fights between us regarding this issues . As two times she deleted that guy's chat infront of me only . And that guy used to call eveytime and i got irritated. Before also she used to tell me i dont want a serious relationship and ur getting so serious thinking of future and marriage. But i loved her so i didnt bothered. Now in past month a lot has happened. We broke up a lot of drama also happened . And one day that other guy calls me and says that i am his bf from past two years y are you just trobling her . And said i m coming to banglore in next two days she wil stay with me in hotel wat else proof u want and said no parents will alloow a girl to stay with her bestfriend. I still didnt told that guy that from past 7 months she is my girlfriend. She complained to my company HR that i m stalking her and troubling her but Hr were good atleast they listened to me and supported me and said to leave her as she is just going to spoil your carreer. Aftwer few days i tried to talk to her normally and she slapped me also. I abused but didnt do anything in return. And her father also called me once saying leave her as she dont want to talk to you u were friends before but now fights has happened dont try to talk to her . At that time also i kept silent only. Then one of his friend also messaged me a threat to hit me i have that screenshit also. Once i was waiting for her outside pg and she made a video and she says thst i will false complaint thst ur always stalking me i have this video also. This is the reson i stop complaing anywhere also. Also when that guy came to banglore my girlfriend tried to book hotel but she by mistake maybe used my credit card and otp came to my no. . I can also say thst they tried to use my credit card also withiut my permission. Now i want take some action against her . Idont know why eveytime only a guy has to suffer . Can i simply goto police and say that guy is still threating me. Please help me as internally i m gettinf depressed because i cant do anything my self esteem is also lost . And that girl is enjoying happily . Ihave recording where that girl abused me several time and even booking of hotel whrre she stayed with me so she cant lie . Please help me i want to sue that guy and girl ,that boy specially as he came in between us.