How to find the courage within to break up with some one?

Dear Readers,
I'm dating my ex again. This time though it doesn't feel right. To be honest it never really did. I blindly started dating him when we first met. Despite my gut instincts about him. When I first him I felt he was emotionally cut off and an asshole. Surely, as months went by these things quickly revealed themselves. I still ignored the obvious and grew to care about him over the course of five months. I loved his family. The morals and values he was brought up with. However deep down inside I had this inner knowing that he is not for me. We are not for each other. And so, one day, he broke it off with me. I cried for a few days. Than decided to move one. I began to go out, get dressed beautiful, spend time with friends and family and simply have a good time! During the course of one month from the time he broke it off with me and after I cried my eyeballs out I realized how incompatible we were and how wrong I was for not trusting my self. Not trusting that inner wisdom that warned me the first time I met him. I had such an amazing time. Then, he contacted me. I waited a week to reply because I wanted to make sure I did the right thing. Whether the right thing was to ignore him altogether or respond in a firm mature manner. Finally, I thought **** it! I reply. We met up. I was on such a happy roller coaster from the time we weren't together that I think it showed on my face, my body, and personailty. I think he could sense how happy I was. Long story short and fast forwarding one week. He becomes infatuated with being with me, professes his love and confesses that he was wrong in the way that he acted. He realized that all I wanted to do all along was love him. He was right about that. So he asked if we could try again. Thoughtlessly I agreed. So now two weeks later I care about him but I'm not in love with the person he is. His character flaws drive me nuts! I couldn't imagine a life with him. I'd be miserable. He's lazy, pessimistic, over critical of him self AND others and extremely unstable. He's a dreamer. Enough said. He has talked about marriage. He now wants me to move to California with him to be close to his mom. all of this said in two weeks! My problem is that I feel BAD! I hate this feeling. Some people, from what I have seen can be strong and do rational/logical/right thing but not me. I feel bad hurting his feelings. I feel bad for his family. I really like them and I know they really like me too. They see the value in me. They see what a prize I am to him. and to make matter worse right when I thought I could do it ...I thought I could find the strength within to break it off ...I see his face book status change to "in a relationship" and then I saw most of his family and close friends "like" the status. and then all of sudden I couldn't do it.

Now I've done some research on how to break up with some one. It all sounds appropriate and great but my problem is actually following through with it and not feeling bad after ward....any one have any suggestions??

Please help!!
I'm 25 and seriously don't want to waste my time. Time is so precious. I know what I want already especially after dating him.
I definitely want to and could settle down at this point if I met the right guy. Not perfect but right.

I could break it off over the phone but doesn't he derseve in person??