Your question was: I'm looking to start a web site similiar to Match.com - but different. How would I go about creating.

Be fair to both of them.  Tell your ex you can't hang out with him anymore because he still has feelings for you and it isn't fair to him to keep seeing him.  Don't tell your boyfriend, it'll just stir things up and as long as you have no intention of doing anything, then it really doesn't matter.  I would stop hanging out with the ex though - give him some space and distance to fully get over you..

Coolas..

If you dont have feelings for your ex, but he has feelings for you...the two of you are no longer friends in the true sense of the word.  It would be a good idea to not socialize or phone this guy so he understands that you are not interested in him.  If you continue to socialize with him he will see it as a challenge to win you over.  I wouldnt tell your current bf unless he is pestering you in a way where he could do damage to your relationship...

Why aren't you telling your ex straight out that you have no feelings for him and why is he in your life? By not saying anything you're leading him on.  Are you sure there isn't a part of you that wants the attention?.

,..

Hmm ya know I guess honestly I didnt think about that.. I mean I know I dont have any feelings for my ex and I know I need to tell him straight out it's just that we were such good friends before....