Unfortunately its pretty common for military wives/girlfriends to get a sportcoat while their guys are away. If she is willing to cross that boundary once, she more than likely has or will cross it again considering she crossed it when you were just gone for some time. I personally would not be able to trust that she wouldnt run into some dudes arms every time you get into a little argument, or if she gets stressed out. Whatever you do, dont regret your time with her, the person you are today for good or bad was made through the choices you made, and now you have the choice to keep improving yourself. Do what your gut tells you though.