Gf keeps asking for breaks

I don’t have any energy to put effort into this. In short , every few months my gf tells me that she doesn’t always feel romantically attracted to me and asks for a break. I always tell her the same thing: I’m in love but I’m ok With being friends if she doesnt feel the same way. She is confusing. Sometimes the feelings come back for her by the end of the convo, sometimes after a week. But knowing that she doesnt like me Sometimes really hurts. And I can tell because she suddenly goes from loving to mean and unresponsive. Which id be ok with if we were explicitly friends but it makes me upset (sad). Im sure this’ll keep happening every time she feels platonically for me for a while too long so. Idk what to say to her anymore. I feel like im saying the wrong things since this keeps happening.

Edit: She has BPD (borderline, not bipolar), maybe I shouldve included that. But she usually tells me when her BPD is affecting our relationship, and didnt this time. Also all the cheating comments are getting old. She barely has a sex drive, she isn’t hooking up while on breaks.