Dream of girlfriend, sexual

I dreamt I was somewhere at sea, in a battle but I don't know what for. after that unclear scene, I recall meeting an unknown girl whom I was intensely attracted to, for reason I still can't describe. somehow we later had a sexual affair, but was interrupted by my real life girlfriend . I quickly rushed to see her and things seemed tense between us for some unknown reason. as soon as I returned to the other girl she was gone. I searched for her, around and at sea. when awoke, it felt like I searched for her all around the world and was on the verge of giving up.