How do I stop loving my friend and learn to enjoy the moment?

You can't think about it. If you are choosing to walk away and you think about it you will find a reason to stay. If you are in love with someone you can silence you emotions but your love will only grow as you spend more time with them. Spend less time together or alone and do things that aren't initimate. Find someone who can be emotionally attached to you and fall in love with them instead. It's always hard falling for a friend, but it happens to everyone-girls and guys.