You tell him what you said here.  You can't trust him, he disrespects you and you value yourself to much to put up with it a moment longer. And you mean it, you don't want him to try to persuade you to take him back. And you don't take him back. And then you figure out why you stayed for so long...

,..

Thank you. I am going to tell him. I have tried to end the realtionship in the past only and I have always failed at my efforts.  most of the time I end up calling him or he apologizes his way back in.  I need to stand firm on my words. I know he's not going to change and I know I can only change myself....i never thought I would be in a relationship (thru Match.com) like this.  I have always been the person who was able to walk away...

I dated a guy who cheated on me once and guess what... he cheated on me again, I didn't find out until years later - but if i'd have opened my eyes i'd have seen it sooner.  my favorite quote: "...once a cheater, always a cheater". some may disagree but not me.

Listen to your gut & good luck...

Sometimes you hurt when you end certain relationships.  That's natural and normal.  It seems you need help in staying strong in getting over that hump of the initial painful period.  You are staying connected to someone who mistreated you...that doesnt make sense and that is what you need to keep repeating to yourself - that he took advantage of your trust and demeaned you.  He is no one to mourn over...