From personal experience, I’d say openly and honestly speak to her before jumping to decisions e.g. breaking up. Mention to her that what she has said has hurt you, and tbh man, there really is no reason for her to be saying those things... unless she is truly unsatisfied with the relationship (which is an issue that will arise during your discussion with her - if there is an issue at all) and in which case, you would then break up.

If you do love her dearly, you’d consider having a discussion with her before breaking it off. And I mean, a serious discussion. Not some half ass, “oh, it hurts when you say that but it’s okay” shit. I mean, “what you said hurt me, and it has made be consider the relationship and how well we work together and whether or not you’re happy in the relationship because hearing you say that, doesn’t make me happy” etc.