I need good advice

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So my bf just left for basic training . Super excited for him it’s been his life long dream to be in the army.... but I’m scared .. we are both very young still and we went through some rough patches back in April and we broke up for two months then he messaged me to get back together sometime in June we got back together and we have been together total of 2 years . I’ve heard many stories about “men in the army cheat” and etc . I know people cheat regardless. he did do things in the past texting another girl from work never told her anything about having a girlfriend thats part of the reason we broke up before . So thats why I need some good advice because my anxiety is going to be bad and I’m such an over thinker and I’m know I’m not going to be able to talk to him a lot . So does anyone have something good for me ??