What should I do?please help

To make a long story short. My boyfriend used to party a lot but really doesn't anymore. He has this friend, who I know as well. I'm not really close to this friend but he is my friend on facebook. Anyways...the problem is, is that he has pictures of my boyfriend holding this other women. He never dated her just slept with her. I'm the only girl that he ever has ever gone out with. We've been together for almost a year now. When I confronted him about it. He replied with well that was a long time ago. Well DUH! I replied with well I understand that but how would you like if you seen pictures of me and my ex lovers. Well he said he wouldn't like. So I was like okay..Will just move on Ill forget about. But now his friend keeps uploading more picture of him and her. SO what should I do? It's really starting to hurt. I'm almost to the point where I don't want even be with him anymore. Oh yeah and he still hangs out with all the women he used to sleep with. Please help