The answer is Yes! because vibrational patterns are constantly changing due to the frequencies we emit as a result of ever-changing emotional and thinking emanations. Yearning and being attached to a specific desire such a wanting to be with a specific person can actually work against the desire manifesting. Do some soul searching, if this relationship is meant to be then why hasn't it manifested? It maybe you need to check in on your beliefs around relationships and check to see if there is any outmoded and sabotaging patterns you need to clear that are hindering a relationship manifesting, nothing we desire can manifest if we have deep conflicting beliefs to our desire in the recesses of our mind. You need to release this person, set him free, that's not to say you won't be a relationship with him, maybe you will end up with this person, maybe you won't, if you desire to be in a loving relationship with the man of your dreams then focus on that, BUT!!! don't put a name or face to this person, just send out the intentions to the Universe of your desire and let the Universe take care of bringing your perfect match to you, I agree with idea of simply sending out the feelings of Feeling totally fulfilled, long-lasting happiness, overflowing with joy, being abundant in all areas of life etc, I wish you the best possible outcome.