Thats a tough situation. I would have to say you would need to control your inner feelings for them and to also place boundaries within yourself so you can keep them as friends.

See you must realize that your friends may not like you back. Relationships with friends do not always work either because you know them so good that it doesn't allow space in the relationship.  

My advice is to simply keep them as friends and allow them breathing room, love them as a friend but nothing more. Start dating other people or hanging around with other people but still remain friends with them.

Its kind of a catch 22 situation.

~ Cat

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So Others May Live.
- Firefighting Creed

Proud Firefighter