<human>: Can you provide a brief rundown of the text in within 3 sentences?

My girlfriend (18) of two years likes to joke about breaking up with me (m19). I have said some things in the past that may seem like I don't, but we have moved past this. I love her dearly and try to show so in everything I do. She says she doesn't feel like I do though. We can be having a great day, then she springs it on me. She will say she wants to break up and I don't take kindly to this. She gives ample reasons as to why it would benefit her, and I explain that it's not the solution we should pursue. Pushing me to tears every time because I don't want to lose my best friend. Then, at the end she will do a 180. She will say that she only says that to hear me fight for her and show my love. I think that there is some truth in her words, though. My question is; does she mean what she jokes about or what she says at the end?
<bot>: girlfriend jokes about breaking up. This brings me to deep sadness and then she says she only does it so I can show my love for her. I just want to know what she really thinks