Love does not flourish by force its grows through slow and deliberate effort. The opposite of it is infatuation and lust, it burns and dies quickly.
If you don't love the person you are with right now because of undesirable habits and character flaws, then the best choice is to leave him. "Huwag mong paasahin sa wala."
If it isn't because of bad habits and character flaws, then it has something to do within you. You can deliberately fall in love to a person by developing a habit of appreciating at least 3 things about the person everyday. After a while, that person becomes the best person to fall in love with in the whole universe.
Stop dreaming about the man you cannot have. Focus on the things you are in control with like your present relationship. Do something to improve it if you think the relationship is worth saving.