My story

Ahh now I study abroad in taiwan( i go to taiwan in October) and my ex ( we just broke up 1 month ago) now in japan to take care for her sister We in love 1 year and 6 months and i do something that crossed the line there ( not cheating) that's swearing her ex friend that guy in the past like my girl and also express his feelings to her before we in love may girl rejected him but when we in love ( we all in the past study together) my girl said that he pursued her long time but my girl just doesn't had feelings for him but when we in love he keep texting her and I said to her that I don't like her to text with him cause who want ur girl to talk to man like her right And couple months past he also had girlfriend yeah and he not texting may girl anymore but when he broke up he immediately face out and texting her back like wtf and then I confronted him like text him alot that don't fking talk to my girl and anh said something like swearing and defaming Past another few months when I in taiwan study I don't know wtf I thinking i just text him and swearing him anh then we just bicker like talk in and take day to fight something like that after that he text my girl and when she know she break up with me then since 1 months and i try to comeback with her because we both still love each other and didn't make out and now I still want to come back to her but she said she doesn't love me anymore I know I wrong but ah what should I do now?