First of all, get your facts right. Remember how emotion can get in the way of good judgement. So be absolutely sure that your friend did this bad thing that they are unremorseful about. (why are they unremorseful?). Certainly you make this person sound a complete arsehole. I would not get involved with anyone who had proven themself unreliable or untrustworthy. You are just setting yourself up for more disappointment.
Marilyn