Well, [ he says after a moment — for once, not jumping straight into reassurances or trying to counter her words, but instead giving them some thought, treating them seriously like she does, ]

It's not like anyone's past can be erased, can it? That's the point of having a past, innit, we have to live with whatever choices we've made. The good and the bad. The only thing we can affect is what we choose to do going forward. That's the part that really matters. So yeah, maybe the past you hurt people, and gave up on people... but the you that you are now is something different. Better. Not despite of your past, but because of it, yeah?

[ he aims a small smile at her, then; that she regrets what happened is a good thing, because it means she's different now. ]