This hasn’t happened to me, but I’ve had similar and I’d be *very* hesitant to stay with someone who did it. I get that things happen in arguments but it’s such a low blow that I’d have trouble respecting the kind of person who would do something like that. Giving him the full benefit of the doubt, it’s possible that if you’re a “covert” stutterer (as am I), he didn’t understand exactly how hurtful it was. I’d have a hard time buying that myself, but I remember friends in high school who would tease me about my stutter but sincerely didn’t mean any malice by it (maybe that’s a “guy thing” because they didn’t see it as some huge deep flaw or disability, it was just a weird trait I had. Has he tried to apologize? Because that will say a lot about him. It’s one thing to forgive a momentary slip of indiscretion that the person immediately repented for, but another for the person to just think that’s OK. When I had something similar when an ex said something especially shitty and hurtful to me, I waited I had cooled down and told her something to the effect of “I know you were upset, but what you said to me the other day is nearly unforgivable, and I think you know that but you said it anyway. It popped the veil of safety I had with you, and I don’t know how to go back. I’m not telling you what to say, but I need to know your thoughts on it so that I can come to a decision that will help me sleep at night.” In my case, she tried to wiggle out of it and shift the blame, so she became my ex and I met my future wife the very next day.