It's a simple case of pros vs. cons. And a fact that most people never change. Liars are more likely to lie again and the 'benefit of the doubt' can only get somebody by so many times. Ignorance is NOT bliss.
If 'the person' contacts you consider your options. Reply in a cheery way implying that you're glad to hear from them and still miss them, reply in a neutral voice that implies you have gotten over the situation and have moved on, or reply in a tone that states 'i'm still a hurt bitch' (and yes, that goes for the men too) or don't reply at all. The choice is yours. Remember that in order to get better you have to rise above some situations and be the bigger person.
Not only can it be a slap in the face to the other person but it sure makes you feel good. ;)