True forgiveness, being an aspect of true charity, requires openness if it qualifies as genuine. IOW, I don’t think we should put conditions on forgiveness, alhtough self-protection is an authentic aspect of the virtue of prudence.
Here’s what I mean:
Very recently, I decided to be the one to make the first gesture to someone who had wronged me. I sensed that it was an important gift to her to let her know by my actions that I had forgiven her, even though she has never apologized to me or so much as communicated with me since the incident. I was surprised at how warm and responsive she was. Even though she has not chosen (since then) to continue the relationship or move forward with me, I think it’s incumbent on me to be open to that, should she want to. Otherwise (it seems to me) I am putting conditions on my forgiveness: I am saying, ‘I don’t really think you deserve ever to be trusted again; I assume you’ll keep doing the same thing.’ Now, I would have a right to be cautious about the renewal of the relationship, should warning signs redevelop, but unless I have indications that she would do that again or is still in the same mind-frame, I think that refusing to keep lines of communication open is making a judgment about her spirituality and her capacity for growth/change. I don’t know if she has changed unless I give her the opportunity to show me.
Nevertheless, I have another person in my life (a relative) about whom I have to be much more cautious because of very long pattern (history) of sabotage & cruelty to me and to my family. In that case, my duty is to be outwardly civil and gracious and kind (and inwardly forgiving), but to measure my communication discreetly, not giving her too much information, lest I and my children become further taken advantage of.
I think it’s important to discern: to take it on a case by case basis. There is a difference between someone who is dangerous – who threatens your emotional health or your practical/financial (etc.) circumstances – and someone with whom you have had a significant relationship but may have made one mistake. Sometimes best friends, for example, have two or three major falling-outs in their relationship over a lifetime, but clearly there are healthy ties there that are mutually beneficial.
God speaks to us, and brings us graces and opportunities, as well as emotional growth experiences, through every relationship we have, including those with co-workers, neighbors, etc.