I'm leaving for basic training and I'm worried about my girlfriend cheating,

me and my girl have been together for about 2 years now, I graduate high school in the spring and leave for basic training for 10 weeks right after that. she's never done anything to me to make me think she will cheat, but I'm just worried, if I'm not there to give her companionship will she find someone else to give it to her while I'm gone? please help do girls always need someone?
I'm leaving for basic training and I'm worried about my girlfriend cheating,
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