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Step 1: Get her out somewhere, maybe with a bunch of people, some party or something, just to refresh her memory of yourself.
Step 2: Kidnap her boyfriend.
Step 3: Get somewhere with her again, if she refuses citing some problems, just say "alright, maybe another time".
Step 4: Rape her, be sure not to get caught or to leave any clues, no one must know it was you.
Step 5: Stage the boyfriend's suicide, it better be good, you don't wanna be caught.
Step 6: Fabricate a suicide note making it seem like the boyfriend had some problems and is admitting in a roundabout way it was him that raped her for whatever reason i.e. "I'm sorry for what I did to you, I'm really regretting it".
Step 7: Leave both in a convincing place and position, so that he's found, preferably by the girl.
Step 8: After few days have passed, casually invite her out somewhere again. This time, if she gives excuses, delve deeper into it, ask her if everything's alright etc.
Step 9: ?????
Step 10: Profit.