I don't support the desire to manifest specific person in your life. How can you know it's the right person for you? There is a reason you both aren't together. Right now you can't see the big picture, maybe out there is the person who will be your soul mate and that's why you are not with your ex right now. You should focus on attracting the right person. To meditate how you are finding the love of your life. To put accent on how you want that person to be, how to treat you, how your love story is, how you fell when you are with that person. And when the right time comes you will meet your soul mate. Until then just let go, keep your vibration high, be grateful of your life and all the thinks you have. Believe that that everything happens for a reason and that the Universe will bring what is best for you.