If he was just in boot camp, he wasn't gone long and that means you either need therapy or to seriously grow up before you attempt another serious relationship. You can't "win someone back" after betraying them that way. If you can, it'll never be the same anyway and you'll end up splitting due to trust issues. Take it as a life lesson... you reap what you sew. Your heart is broken of your own doing, and the sooner you understand that, the sooner you'll be able to engage in a meaningful relationship where you have less chance of self destructing. Just call me "tough love" Dr. Phil of the internet tonight, but face the facts.