Military Girlfriend , and cheating

I am currently in a relationship with a man who is in the Army. I can tell that our relationship is very genuine he is the most caring devoted person i have met. I am going to college next year and he gets his orders next year as well. I have no problem with going with him and finding a school near him but i am very worried about deployments and distance. My mother and her ex husband are both in the military and he cheated on her on a 9 month deployment, so have her other friends experienced the same. I don’t want to go through the same thing. If he gets orders over seas i don’t know what to do either i don’t want to get married for a few years. Do any of you worry about faithfulness?