I'd be concerned and ask myself why there's a dude claiming to be my husband and why he murdered my Dad. :v
But in all seriousness, I would just take that moment to do the most unpredictable thing possible, but considering she's saying "How much of his love was true, now that I'll never know" I'd just make her dead inside. Like her just.... silent. Maybe make her stare like she's looking into the void. Like she's still "processing this".
Or maybe she's like "What would Daddy do?". Maybe if her Dad's good enough, she can straighten up and be like "Look man, I just need to accept that you were just doing whatever to seek justice for your father and mine got caught up in the mix". Maybe this could be a good opportunity for her to be like "What would I do if the tables were turned?".
Maybe she's irrational at first but then other characters were like "If the tables were turned, would you do it?". Depending on who the husband's father was. I haven't read your comic in a while, but I'm ASSUMIIIIIIIIING that they got together because they both got dead Dads.
Maaaaaybe she's like "I forgive you but like.... you still killed my father... I think we need to break-up".
OR MAYBE she's like "screw you" and then you introduce a villain, your lady character in the panel kills the villain (because he's somehow connected to the Dad's death), and then they meet a character. You play the long game until the gang finds out "Oh crap.... we just killed their Dad". And the lead just feels bad for this and then she contemplates how many orphans she created. Maybe have those orphans/widows come back as antagonists or maybe give her a reputation making her ask more questions morally speaking. Then she goes up to the husband. She doesn't SAY she forgives him, but he is like the only person she can talk to and the two ease-up into a couple again :v