Drop in for an unexpected visit with flowers and chocolates. Tell her how beautiful she looks, wash the dishes, rub her feet, let her pick out the movie, and listen attentively as she tells you in minute detail about her day.
Bridge the gap with however way you can. Show her how much you care and love her EVERYDAY. Make a move to finally bridge it and be with her. Being with her will be the ultimate showing of how much you really love her.
Don't remind her that you are not together. Just remind her how much you love her, and prove how important she is to you. Example: instead of going out or going to bed talk with her on the phone or video chat, send her love letters or things that relate to what you talk about to show her you listen and care (she will be thinking of that all day). And lastly during your break time like a weekend, spring break, or take time off, to visit her.