Vector, whatever he has done, he's only human--if he'd live his life in a torrent of scorn and hate against you, then death onto him and his values for being so inhumane. I only request that you'd not develop a sense of paranoia because of what he has done to you, and forgive me for saying this, no offense intended, but in a different viewpoint, your mother has a good point (though I do say it was not worded in a way to possibly reciprocate her feelings in a clear manner).
You know what he's done is bad. He cannot hurt you if you know what he's capable of. He's only human, and you've seen what qualities, what characteristics are hateful--what deserve hate or anger or avoidance. What I believe she means is that you really needn't be bothered by this--what's past is past, and while the idea of 'old wounds remain', and the possible pain inflicted before--it's before you now. It's not
with you
now. Judging from what I've heard you say--he isn't a stalker that watches you 24/7 or possibly someone to hunt you down and ambush you causing fear and rancor. It seems more like fear taking hold of you because of what he has done. The fear(? - well the concept of it) remains. Maybe...you've been dwelling on it for far too long that it seems overinflated than what it really is?
Forgive me again if my words strike badly or wrong to you, I know I'm real bad at English when I do this thing, nor do I mean you any harm, but do not give in to fear, most possibly understand it. You are stronger than what cripples you, and you know this. (even if you don't...somehow feel it at the moment. It's hard to explain for me. I'm comparing who I've seen you are before and who you are now in this state...if it gives any clarity.)