not feeling like sex

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Hey guys so I'm 17 and have been with my boyfriend over a year and a half now don't get me wrong I love him but lately I just haven't been in the mood for sex. We've had sex before and I'm on the pill and he uses condoms so it's not the fear of pregnancy I really don't know what it is. I think it's affecting my relationship and was wondering if anyone has had this problem and how to fix it? Thanks in advance x