He's happily married. Don't interferre in his life. Maybe he madly loves his wife, his kids if he has any. Try to get your mind over him. The feeling you think is love, is actually infatuation. Do what you like? Drawing, skating, boxing, reading books? Anything irrelevant, that makes you remember about him. And don't talk to him, I know he would think that you are becoming rude, but sometimes in life, you just have to stand up for yourself. After a few days, the feeling which you think is 'love' will fade. Try avoiding him, before you completely fall for him.
The other way, which i don't recommend, is to find someone new. What guarantee's you that he will be the one for you? What if you never fall in love with him, but he fell for you? Would it be wise, to hurt someone, inorder for you to move on? Think for a bit. Always go to a relationship, when you're ready, not when you're desperate. And before going with someone, try erasing the feeling you had for the previous one, or any person whom you like/love. :)