Help!!! Trying to get my girlfriend to Orgasm.

Marcus
Aight, so been dating my girlfriend now since March. She goes to a different school than me so we only get to see each other for up to 4 days at a time during a month. When we are together we have sex a lot, however despite the numerous times we've had sex, she's never had an orgasm. She claims to have gotten close a few times, and every time during sex she'll tell me, but I nearly always cum shortly after she tells me. Usually when this happens it's already been 10-15 mins so I can't do much longer. 
I really want her to have an orgasm. We've done everything, from foreplay, whether it's massages, doing things with food, various positions. I really want to get her to orgasm. 
Like I said she claims she's been close plenty of times but never actually had it. 

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