Have a loving boyfriend and I don't know why its not enough :(

Thanks for taking the time to read this. Basically, I'm 18 and have a slightly older boyfriend. I'd done everything else with other people but our first time was together and we've been together since, but whilst he is completely happy to only have sex with me ever I'm not so sure I'm the same. I know its selfish :( hes the most amazing, caring guy ever and I feel bad for even thinking that I might want to sleep with someone else. I would never dream of cheating on him. Hopefully I'll be starting uni in September and he'll be living around half an hour away so the distance is not a problem. Please help, will this fade? I couldn't bear to lose him, and I just don't know whether I'm just going to carry on thinking like this because its not nice and I feel bad on him for it. Do I just need to suck it up and decide I'm not going to sleep with anyone else in the foreseeable future? Any advice would be much appreciated.

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