You ' re thinking about this assbackwards . Flip it around . If you started getting texts from another girl while having sex with her , how would you react ? If you continually were in contact with this girl , etc ? You ' d be putting this other girl in her place while proving to your GF that nothing is going on , right ? That ' s not what your GF is doing . When she comes back , put the poker face on . Sit down , and let her talk . Odds are she ' s gonna dump you . So don ' t be a chump about it , just hear her out . If she does dump you , let her go . Shrug your shoulders , don ' t shed a tear , and say goodbye . If she doesn ' t and she starts to lay all kinds of BS on you about this other guy , just say thisListen , where there ' s smoke there ' s fire . Do what you want with who you want . I ' m not fighting for you . If you want him , there ' s the door . If you don ' t , he goes away . I ' m not being someone ' s second choice . And don ' t defend it . Don ' t argue about it . Just say it and let her make her choice .