Think about whether you really loved. The fact that your feelings may not be more than a fad, and if you try to conquer your boyfriend or girlfriend, and then cooled off, then to regain trust relationship will be too difficult.
Keep yourself in hand and do not rush. You might want to do something don't make friends: to seek a kiss, a romantic evening, etc. don't let yourself too much, because otherwise you may surprise, and even alienate a loved one, to turn him against himself.
Remember everything you know about your loved one, and especially about his relationship with the opposite sex. Friends often tell me even about the most personal, so you should be able to without difficulty understand it, what is the perfect partner for your friend, what should be a loving relationship from his point of view, etc. Strive for perfection and do not leave attempts to attract the attention of your loved one.
Do something nice to your friend. You probably know that he loves the most, than is fond, what dream. Give signs of attention, though, start with small but nice gifts. To present them on occasion, and without reason.
Try to spend more time together. Go to the movies, cafe, theatre, etc., walk, attend concerts, engage in your hobby. Try to ensure that your friend is used to you and needed in your community.
Don't be afraid to touch the beloved. As the friend you can afford to put his arm around her, to take the hand, Pat on the shoulder. Add a more intimate gestures: for example, you can pretend to clean the hair off the face, and under this pretext, to hold a hand on the cheek of a loved one. Watch out for his reaction.
Embark together on a journey. This can be as a hike and a visit to the recreation, ride hitchhiking, etc. as long as you were together. Try to add a little romance. And finally, if you feel that your loved one is well with you, confess your love to him, or at least hint about your feelings.