Like both spike and Macid have said, there is no real easy way out of this. If you still wanna try and make it work then best thing you can do is just sit and talk with her/him about how you feel, both of you should try and come to an understanding, but if they dont agree with your choice, then calmly say that you dont think its working out, and that you feel it best that you to have a break so you can both have some time with friends and just take your mind off of things, just try and take it easy, try not to put to much pressure on yourself and them.
Since if you to put distance between yourself, and try to get to know each other better, you may find out that there are feelings you both have, and when you have space for awhile it makes things easier as you can relax and do what you like to to help. If you ever wanna talk more feel free to PM me or add my MSN, Im more then willing to try and help, I have been in this situation before, so I can tell you what i did, even if it wont be the same for you, it may help.