Tell them, let them know terrible they're making you feel. I know it's easier said than done, but if its a true friend you should be able to talk to them about ANYTHING. Also, true friends should never judge each other. Approach them them tastefully, don't let them think you're attacking them. If you set them off on the defensive from the very beginning then you'll get nowhere. Be firm but calm and keep your mind open to be able to grasp their response. ALSO, make sure you prepare yourself for them to respond with things you may have done yo upset them. If this happens, keep yourself off the defensive side as well... Ask what you can do to better the friendship and apologize for hurting their feelings. You both may have hurt each other without evening realizing it! If you try to talk to them and nothing changes or it gets worse, I would strongly consider parting your own separate ways... GOOD LUCK!