Between Friends

What do you do when two close friends put you in the middle of there drama?
I have two very close friends and I care about them equally, however they have me in the middle of a their major communication issues/problems right now!!!
Who's side should I choose?
Background:
Friend A who's male has difficulty, like most men expressing feeling to friend B who's female; now friend B has tried to get friend A to open up, but he hasn't; as a result their friendship has drifted apart. Friend A wants to try to work on opening up, but has problems now because friend B has started to confiding thoughts and feeling with a neutral 3rd party. Who by the way may or may not be attracted to friend B.
My dilemma:
Do I give advice that may backfire and as a result leave everyone mad at me?
Do I say nothing and keep listening to both of them express their thoughts on the situation?
Do I tell each of them to stop venting to me since I feel stuck in the middle and don't want to choose side. ***(plus I can't -even if I wanted to-I understand both point of view) ***
Or lock them both in a room and let the duke it out (LOL)
SOMEONE WISER THAN ME PLEASE HELP!!!!