I have felt like this in the past, and I understand how you feel. What worked for me is realizing that you are responsible for your own happiness not someone else. Believing that this is the only person who is right for you is an exaggeration of fear. I have deeply loved many people in my life and sometimes circumstances beyond my control have taken us on separate paths. I do not regret loving these people, but at the same time I know I will love again. If my path in life brings me back to one of these people I will greet them with open arms. If not, well lets just say putting myself on hold until circumstances change is taking a chance that you will miss out on something even more special.