relationship

I have been in a relationship for 8 years. I really love my boyfriend and can't stay away from him. About two weeks ago I findout he talked to another girl and met her once and kissed her aswell. He felt really guilty and regretted alot and hide it from me. I found out from a third person and was heartbroken. He was apologizing and vowed he will never commit this mistake again. I don't know what to do ? please anyone have any suggestions??.. I can see in his eyes that he changed and would never commit the mistake again but I still have that feeling in my heart. I love him alot. should I give him another chance?