The way that someone speaks to another really matters, regardless of the context in which it is. In a romantic relationship, the way that you and your partner speak to one another is certainly important. Just because you're in a relationship with the person and the two of you claim to love one another does not mean that either of you can treat the other poorly or speak to the other in whichever way you'd like. If your partner ever says these things, they're toxic, and that's something about which you might want to know.
Dealing with the difficult, toxic, or emotionally abusive things your partner might say, even if they claim that it was in the heat of the moment, can be stressful and emotionally exhausting. And though it's possible that they didn't realize what they were saying and didn't recognize that they were crossing a line, hurtful and destructive comments aren't something you should just have to overlook. Reaching out to a therapist or counselor or someone else (like a family member, close friend, or organization with resources) who can be supportive and help you determine how to try to repair the relationship or extricate yourself from the situation can be your best bet. If your partner or your relationship is toxic, you need to make sure that you're taking care of yourself and doing what's best for you in the long-run.